Hopefully I won't eat into my ammo supply to bad getting used to this new setup. These accessories are designed to mount to M-LOK® compatible handguards. Planning on getting the mid-length version for my 12. NEW Centurion Arms C4 m-lok rail Just go an email announcing the release of their new rail. #56M-CV-EXT Spartan Rail - Carbine Length Extended Handguard for A2 Front Sight $316. I was trying t. 00. 0 Back Order. 00. C4 M-LOK Rail (12in) Centurion Arms LLC is happy to announce the C4 MLOK® rail. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o'clock rail and MLOK slots for. Regular Price $23. 5” choice. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Board policy mandates I state that I shoot for BCM. 0). 00. The M4 carbine (officially Carbine, Caliber 5. 0). Thread Tools. . Cut the delta ring assembly and handguard cap off and bolt the handguard on. Yup. It's designed to enhance your AR15, M4, and M16 type weapons systems, with precision, stability, and balance. View Details Sons of Liberty Gun Works EXO2 Handguard - 10. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. BCM Recce-16, Running. C4 M-LOK CARBINE CUT. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o’clock rail and MLOK slots for the 3,6, and 9 oâ clock positions. C4 M-LOK Rail (12in) $310. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. PSA Gen 4 Classic – Best Affordable 9mm Carbine. Add to Wishlist + Out of stock. I've used more than one MI M-lok drop in, no complaints. If you want to use the stock barrel nut the Centurion C4 mlock rail is great. In Stock. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. Includes two M-LOK Accessory® to Picatinny Rail Sections. Thread Tools. M. Most time consuming part was removing the delta ring, hand guard retaining clip, and cutting off the sling tabs, smoothing them out and re-bluing them. One end slip under the Delta ring and is secured by four set screws to the barrel nut. 1 In Stock. Centurion Arms C4 Quad Rail Handguard – Carbine Cutout. Features. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. No messing with BCM or LMT’s insane pins to remove. 95. Show Printable Version; 12-14-20, 12:57 #121. PSA Custom Cross-Cut Lightweight 15" MLOK Partial Picatinny Handguard . Quick view Out of stock. Brand. MPN: VMARMLCET. PSA 16" Midlength 5. After Christmas I'll figure it out. $314. Picked up this upper from BCM to be delivered this week…The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. An M-LOK Rail System looks like a long tube that has sections cut out along the entire length of the piece and all around the piece, which allows for M-LOK accessories be mounted to many different parts of the system. 00. In fact, the M-LOK system has approximately 3x the industry support as KeyMod. Thread: NEW Centurion Arms C4 m-lok rail. Daniel Defense Omega 7 rail would work, 2 piece that locks into the delta ring via set screws and free floats the barrel so your front handguard cap doesn't matter, available in mlok and pic rail. View Profile View Forum Posts View Articles Member Join Date May 2013 Location GA Posts 263 Feedback Score 1 (100%) Originally Posted by munch520. View Details. The MLOK C4 rail system is based off the patented quad rail version. † NOTE: The receiver-mounted, Picatinny-style rail is designed to accommodate most optics and optic mounts intended for use with Picatinny/ MIL-STD 1913 rails. The winner of this contest is clearly M-LOK. ETA: the midlength cutout rails are an inch shorter at their longest points than the carbine FSP 12” models, on the spec sheet, so I guess there’s that. A. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Just cut down the fsb and go with whatever free float you want Posted: 10/28/2017 2:02:21 AM EST. 99 $74. Material: 6061 T6. – C4 M-LOK Rail (Carbine Cut) – $280. 5" Carbine Cut Out Picatinny Rail Handguard. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12oâ clock rail and MLOK slots for the 3,6, and 9. Magpul Ladder Rail Panel Cover Picatinny Rail 18 Slots Black Made in USA Black. View Product. 00. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all. 95. Made in USA. 99 $76. Save 5% MSRP: $ 280. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. Ergo. Rating: 100%. This venerable design is awesome for several reasons. $109. Centurion Arms C4. Material: 6061 T6. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o clock rail and MLOK slots for the 3,6, and 9 o clock positions. Trending at $12. The C4 system uniquely features the use of a standard mil-spec "toothed" barrel nut, which makes for an. The Night Fighter is an M-LOK rail system designed with IR lasers in mind. January 28, 2020 ·. 95 $115. I have had 5 C4 rails including the cut outs at one time or another. The M-LOK® C4 rail system is based off the patented quad rail version. 18 shipped with code February. Rating: 94%. Last edited by AAMP84; 01-30-21 at 03:23 . I’ve always liked the C4 rail as a future upgrade for FSB equipped rifles. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12 o’clock rail and M-LOK® slots for the 3, 6, and 9 o’clock positions. UTG PRO AR15 Super Slim M-LOK Carbine Length Drop-in Rail, Black. officerX Replies: 0 Views: 316 4/26/2023 12:11 PM All-New Night Stalker PRO Carbon Fiber Shooting Tripod from Night. 5" M4 Carbine Upper Group;. 99. Mintyfresh790. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut. Save 23 – 27% MSRP: $ 109. Out of Stock. 00 Your Price: $30. Rear sights are quite noticeable when in front of an optic and obscure a lot of the view. This design allows the installation of the. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. 3" pistol DD barrell, Benelli M4, Ruger 10/22 w/Victor stock, GLOCK 17 Gen 4, Dan Wesson Valor. ODIN Works M-LOK 308 Free Float Handguard. 00 (Intro Price $238. 00. A machine gun rental in Las Vegas posted they had tried 20 Colt M4 Carbine LE6920 OEM1 (same as the OEM2 except it have a front sight base) in 2015 it was legally converted to full auto for rental purpose, they didn't even cut the barrel to 14. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. 5 inch rifle? i will be shaving a fsb and want to put a rail on it. MountainRaven. Mil-Spec M5 Rifle RAS for M16A4. The MLOK C4 rail system is based off the patented quad rail version. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Right To Bear 7. 5" middy Noveske Afghan X3, 10. Description. Out of Stock. TRYBE Defense 16 in Wylde Government Profile AR Carbine Barrel, . Finish: type 3 hard coat anodized. View Profile View Forum Posts View Articles Industry Professional Join Date Jun 2006 Posts 12,742 Feedback Score 1 (100%) Originally Posted by Eurodriver. Description. WTS: Centurion Arms C4 M-LOK Carbine Cut Rail. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. [PARTS] Centurion c4 mid-length quad rail cutout. . 223 based AR platform systems. $230. One thing to consider if you decide to go with a completely new rail is that you will need a new crush washer, a new lo-pro gas block and possibly a new gas tube. (15" length) VIEW DETAILS. They can be placed in any of the 7 angled M-LOK® surfaces. Great quality and lightweight handguards. Show Printable Version; 11-27-20, 09:29 #101. 95 $183. 95. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o'clock rail and MLOK slots for the 3,6, and 9 o'clock positions. Angled Offset & ERGO Sling Swivel/Bipod Mounts. Finish: type 3 hard coat anodized. 01-14-21, 19:20 #162. * Read More expand_more Read Less expand_less. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. 95. Quote: Originally. 95 Save $11. 00 In Stock C4 M-LOK Rail (Carbine Cut) $280. 5 inch mid length carbine was a great idea and If they would have used the MK8 rail they would have a great new upper. It measures 9. 3" pistol DD barrell, Benelli M4, Ruger 10/22 w/Victor stock, GLOCK 17 Gen 4, Dan Wesson Valor Duty Coat, Dan Wesson Valor Blue, Dan Wesson Silverback 10mm, S&W 27 4" NEW Centurion Arms C4 m-lok rail. 56 mm, M4) is a 5. However, my son and I are using their 15" rail on our SPR/Mk12ish builds. NEW Centurion Arms C4 m-lok rail. Shop VISM AR15 M-LOK Carbine Handguard | 4. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Hey everybody, so I have the SAINT 5. Reply. View Profile. . In Stock. 1oz w/stand barrel nut. 37" Continuous 1913 Picatinny Top Rail;. C4 MLOK MID CUT The MLOK C4 rail system is based off the patented quad rail version. 16” carbine? The rail/proportions is making me not so confident. 95 – $ 129. I am looking at these two handguards: Centurion C4 M-LOK Rail (Carbine Cut) BCM® MCMR-7 (M-LOK® Compatible* Modular Rail) I really like the Centurion due to the extra length on the sides going around the front sight tower. I was originally going to go with a simple Magpul SL handguard until I came across the C4 carbine cut rail. But they only had pic rails which are needlessly heavy. 50. Thanks for the reply. 5 inch like the. The M-Lok rail system features elongated slots similar to Magpul’s MOE slots. Save 5%. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. I've been waiting for the C4 M-LOK Rail (Mid Cut) to come in stock forever, emailed Centurion a couple weeks ago to inquire about timeline, Corrie got back to me less than an hour later (Thank you very much Corrie) and let me know they were expecting them the following week. ”New levels of dissimulation being reached for - and gained – in the faux journalism/gov spokesmen/shadowy ‘intelligence’ nexus which blends together the worst elements of controlled medias, puppet governments, & mafia-led ‘security’ forces, as our ‘post-reality’ era jets further and further away from any remotely real ‘events,’ authentic. 00 Best Rated. 00 $320. This design allows the installation of the rail on an upper assembly without removing the front sight post or permanently attached muzzle devices. 5" Mid Length Upper Group; 14. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. Centurion Arms LLC is happy to announce the C4 MLOK® rail. Product Identifiers. This strong and lightweight 2-piece design can be installed easily onto standard AR-15 uppers after removing the delta ring and hand guard cap, a task easily accomplished with hand tools. I am looking at upgrading the rail to an mlok rail. It comes with with an M-Lok handguard, using Daniel Defense's patented "Bolt-Up" mounting system, wherein the handguard is attached using hex bolts that pass through a plate clamped around a. It is a lightweight, rugged, 2-piece free float rail that, when installed, provides a continuous 12 O'clock rail and MLOK slots for the 3,6, and 9 O'clock positions. The C4 allows for a rigid rail platform and features the M-LOK interface at 3 positions. This comes in an even softer shooting rifle-length gas system and 15″ M-LOK free-floating rail. Address: PO Box 122 Flatwoods, KY 41139; Phone: 502-771-2157; Welcome to Thoroughbred Armament Company LLC LOGIN / REGISTER; FAQ; ENGLISH; USD; 0. Last edited by AAMP84; 01-30-21 at 02:23 . 6618 posts · Joined 2005. 00. Mil-Spec. C4 M-LOK Rail (Carbine Cut) $280. Installed my Centurion C4 MLOK Carbine cut rail on Colt 6933 11. AIM Sports M4 Handguard Quad Rail, Carbine Length (81) $39. It's the only cutout rail I've ever. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. C4 Rail, Carbine Length Cutout Rail Handguard. Building my first rifle and need some help. 5 oz. The C4 system is the lightest and most rigid rail that clamps to. Add to Wish List Add to. 00 In Stock Newsletter Signup Centurion is proud to offer our new C4 M-LOK Rails! Price: C4 M-LOK Rail (Carbine Cut) – $280. The Centurion patented C4 rail system is a lightweight, rugged, 2 piece free float rail that when installed gives the uppers a continuous 12o'clock rail. 99 Save Up to $65. It also gives you the most length for hand placement or area to mount things like Angled Forward Grips, hand stops, keymod or m-lok accessories and the like. The carbine cutout rail is nominally 12”. 26 (100%) Originally Posted by abso. cultist Discussion Starter. Page 3 of 6 First 1 2. Shop MFT Tekko Polymer AR15 Carbine 7" Drop In Rail System | Up to 13% Off Highly Rated on 5 Reviews for MFT Tekko Polymer AR15 Carbine 7" Drop In Rail System + Free Shipping over $49. 0, mid-length - 9. Designed to be used with a carbine length, mid length, or rifle length gas system with a FSB or a pistol length gas system with a low profile gas block. C4. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Geissele Mk16 rail 13. The C4 system uniquely features the use of a standard mil-spec "toothed" barrel nut, which makes for an. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. C4 M-LOK Rail (Carbine Cut) - $280. In Stock. )Centurion C4 M-lok (Carbine Cut) Handguard Centurion Mlok Rail Panels in ODG Centurion Black Handstops Centurion Billet Bolt Release Centurion Billet Pins. ProvenArmsOutfitters. C4 M-LOK Rail (12in) $310. 5" MC Carbine-Length M-LOK Rail. The 2-piece design allows for installation to a standard barrel nut without removal of the muzzle device or front sight post. C4 M-LOK Rail (Carbine Cut) – $280. Description Centurion Arms LLC is happy to announce the C4 MLOK® rail. The CMR system clamps to a proprietary barrel nut that can be installed on 5. This design allows the installation of the. The MOE handguard is just too bulky/awkward for me. Pretty sure Midwest Industries also makes/made a two piece drop in that is compatible with a triangle cap. I’m interested in the the C4 M-LOK Rail (Carbine Cut). Just share pics and some general specs. We offer a variety of lengths, materials and. I am looking at these two handguards: Centurion C4 M-LOK Rail (Carbine Cut) BCM® MCMR-7 (M-LOK® Compatible* Modular Rail) I really like the Centurion due to the extra length on the sides going around the front sight tower. Has no more than 100 rounds through the barrel. Accessories are mounted directly to the front face of the slots using a cammed T-nut. AR-15. The price of liberty is, always has been, and always will be blood: The person who is not willing to die for his liberty has already lost it to the first scoundrel who is willing to risk dying to violate that person. 00) Pre-Order, Shipping by Mid-March; C4 M-LOK Rail (12in) – $310. Fit and finish is above nice. The Trilok rail has M-Lok on 7 sides, I believe it’s the only wedge lock that offers M-Lok on 7 sides. 99 10% Bonus Bucks. 95: MAG583: Magpul M-LOK® Aluminum Rail 9 Slot: $23. There is no need to access the rear side of the rail for mounting. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Does anyone know if a bayonet can still be mounted if using this rail? No, talking about this style of rail C4 M-Lok carbine FSP but for a mid length possibly with a CMR type lock up. In this video I swap out a Magpul SL handguard for the drop-in Centurion Arms C4 Carbine rail. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o'clock rail and MLOK slots for the 3,6, and 9 o'clock positions. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all. View Details. No messing with BCM or LMT’s insane pins to remove. are needlessly heavy. 00 $ 266. Many builders prefer maximum versatility, accuracy and comfort using a free-floated M-LOK rail. The MSRP range from $229. Finish: type 3 hard coat anodized. Thats exactly what I was thinking, the C4 is specific to the design of the barrel nut. 99. View Details. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. C4 M-LOK Rail (Mid Cut) $320. ETA: the midlength cutout rails are an inch shorter at their longest points than the carbine FSP 12” models, on the spec sheet, so I guess there’s that. PSA 16" Midlength 5. View Details. 56×45mm NATO, gas-operated, [b] magazine -fed carbine developed in the United States during the 1980s. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. . Add to Wishlist + NBS AR-15 Ultralight M-LOK Free Float Handguard. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. 5 Too easy. 00. It is a lightweight, rugged, 2-piece free float. I also ordered a Magpul The M-LOK Hand Stop and their M-LOK Rail Cover, Type 2 NYH1. Centurion Arms AR-15 C4 M-LOK Rail. This is a full installation video for the Centurian Arms C4 Carbine Cutout Quadrail. 28 Options. One of Centurion Arms' most popular products is the C4 Rail System, a free-floating handguard for AR-15 rifles. C4 MLOK 12in FSP (For Carbine Gas FSB's) The MLOK C4 rail system is based off the patented quad rail version. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. TommyG. **Please note that some FSBs may need to be modified to fit by. 95 $ 28. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o'clock rail and MLOK slots for the 3,6, and 9 o'clock positions. The C4 is a lightweight, rugged, 2-piece design, it clamps to the OEM AR-15 barrel nut. C4 handguards are available for everyone and nearly every rifle. I can't seem to find a suitable handguard replacemnt for my Colt 6920 with Magpul MOE handguard. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Drop-in is not a good description though, as the installation. Description. This design allows the installation of the rail on an upper assembly without removing the front sight post or permanently attached muzzle devices. The handguard, also known as a “rail” is one of the most important parts of an AR-15 or AR-10 type rifle. One new winner* is announced every week! You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news. 00 $249. Centurion Arms C4 M-Lok Handguard - Carbine Pocket 12" $332. 12-22-20, 09:38. Material: 6061 T6. C4 M-LOK Rail (Carbine Cut) $280. Show Printable Version; 06-05-22, 16:14 #231. The MLOK C4 rail system is based off the Centurion CMR quad rail version. I need to order some grippy panels and fine tune everything. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. 0, mid-length - 9. View Details Centurion Arms C4 M-Lok Handguard - Carbine Cutout. The KINO has a LPGB in the carbine gas position but the FSB is in the Mid-length position. I've never used their cutout rails. Home; Shop All; FIREARMS/PARTS; AR15/AR10; UPPER PARTS; FOREARMS SYSTEMS ; AR15 HANDGUARDS ; Centurion - C4 Rail (7in - 12in)Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. In Stock. What would be a good option for a drop in hand guard as I do not want to lose my front. Description. It's listed at only weighing 9. but I'm not sure it's worth making a. 00 (Intro Price $263. $299. It is a shortened version of the M16A2 assault rifle . $230. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Thread: NEW Centurion Arms C4 m-lok rail. 8 oz. Actual length when measured to flare is 7. yep, but it's worth the wait!Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. it feels balanced. Option. Add. 56 NATO 1:7 Nitride 15" Lightweight M-Lok Upper w/ No BCG and CH. 5in, Black, NSN 9305. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. It can be assembled/disassembled without removing the front sight post or pinned muzzle devices. B5 Systems Drop-in Midlength Handguard for AR-15. 5 L, Tan VMARMLCET. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. Find and buy perfect handguard for your AR-15. . Buncheong. Thread Tools. Centurion Arms C4 M-LOK Handguard – Carbine Cutout. Code: K2-HZ-AR15KH-VMARMLCET. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. The MLOK C4 rail system is based off the patented quad rail version. Fortis Night Rail™ 556mm Free Float Rail System – M-LOK for AR 15. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. 95: JPROS: 45° Rail Offset Adapter: $62. Quick view Add to Cart. 39". Derek33. Save 3% MSRP: $ 29. C4 Carbine Length Cutout Rail, 2 Piece Free Float Rail, Black Finish 0609-CC. When I purchased the rifle it came with the B5 Systems mid-length M-LOK handguard. micmac Replies: 0 Views: 60 6/11/2023 4:32 AM. 56 NATO 1:7 Nitride 13. This design allows the installation of the. 5 inch pinned and welded Colt socom barrel. C4 Rail, 12in Front. Makes my Triarc look. 20. 5" Centurion MLok Rail? If one doesn’t have a front sight, or if one is building an AR from scratch, or if the length of one’s barrel precludes the >10. 95 to $350 depending on model and finish. Posted: 4/25/2017 4:49:26 PM EST. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. 00 (Intro Price $263. PSA 16" Mid-Length Pencil 5. We often hear a lot about how great the M-LOK® system is for mounting accessories on AR-15 handguards. 00 : M-LOK AR-15 Handguards for Sale at Joe Bob Outfitters! Subscribe to our Newsletter:Yup. C4 Rail (7in - 12in) $230. 00 Your Price: $171. Billet C4 upper/lower set, C4 bcg, Radian CH, Centurion 11. BCM® PMCR (Polymer M-LOK® Compatible Rail)* Carbine Length-BLACK. Description The Centurion patented C4 rail system is a lightweight, rugged, 2 piece free float rail that when installed gives the uppers a continuous 12o'clock rail.