Mk18 Mod 0 CQBR upper receiver group with enhanced SOCOM Colt 10.3" barrel

$1,519.95 - $1,739.00
Assembled to Order, Ships in 2 to 6 weeks

Colt 10.3" Mk18 Mod 0 enhanced CQBR upper receiver group

This is a Colt Mk18 Mod 0 with enhanced SOCOM barrel

I started to go back and forth... Is this a Colt or a Potomac Armory?  Is a Mercedes AMG a Mercedes or an AMG ?  I guess it is a Benz after all.  There are just a few upgrades from Potomac.

Potomac started with a pure Colt Mk18 Mod 0, and swapped the barrel out for starters.  Instead of the traditional "thin" Government profile barrel, you have here a Colt SOCOM profile barrel, which is what Potomac calls the "enhanced" model of the Mod 0.  I have seen people refer to this as a Mod 0.5 and even a Mod 3, but let's keep it simple.

Also included is Knights Armament KAC NT4 flash hider (other options available), Knights Armament CAGE Code RAS rail covers with carbine M4 RAS, and the PRI Gas Buster charging handle to complete the best Mod 0 money can buy.  After all, Charlie's is an aficionado for fine SBRs.

The CQBR upper receiver group is assembled by Potomac Armory, exclusively for Charlie's Custom Clones.

-- Colt M4 upper receiver. Mil-spec perfection. This is what you want. This is the real deal. All upper receivers are Colt CAGE Code marked, usually Square Forge marked.

-- Mil-Spec M4 RAS quad rail with 3 Knights Armament CAGE Code 11-ribbed rail guards. The real McCoy. The Mil-Spec RAS is from Prudent America (formerly P&S Products), the same supplier to the US Military for the carbine M4 RAS.

-- Colt complete bolt carrier group, mil-spec phosphated finish. Note: for effective reliable shooting with a 10.3" barrel, you need a high quality bolt and carrier group, especially if you might be shooting rapid fire or suppressed. Colt is what our men and women fighting the enemy use and rely upon to save their lives. Yes, there is a lot built into a Colt bolt and carrier group that you will never need.  But you got it anyway.

-- PRI gas-buster charging handle. This is the crème del la crème of military charging handles. Yes that is French. With suppressed fire or just rapid fire, an SBR is going to kick your ass with smoke and gasses. The PRI gas buster ports the gas out to the right, away from your face (not intended for left handed shooting).

-- Colt 10.3” SOCOM chrome-line mil-spec barrel with 0.07” gas port and carbine gas system with integrated FSB. This is the best 10.3” barrel out there. 

-- Choice of military correct flash hiders

 Note:  For the improved RAS version, take a look at:  Mk18 Mod0 improved CQBR with Free Floating RAS

Note:  specifications above are current.  Some pictures maybe dated.  Please rely upon the specifications.


   ITAR Product
By adding to cart, I understand, acknowledge, and agree to the Export Policy. I am a US Person, and I do not intend to export this product. 

Please feel free to ask questions before you buy.

Note: Any serial number(s) in photos are not necessarily the same serial number as the item that will ship. Also, for items where I am selling more than one of the same item, the pictures are meant to be representative of the item that will ship and show you the details of the item. Packaging also can vary, one item to the next.

a note on the 10.3" SOCOM barrel from Potomac Armory:  The Colt 10.3” barrel came to us from Colt as a 10.3” SOCOM barrel, but was made for the Colt monolithic 6940 rifle, and was an over-run on a contract. The Colt 6940 does not use an M4 extension with feed-ramps (don’t ask, not sure why). We had a Colt armorer re-fit this barrel with an M4 extension, double-measure head-spacing and improve the gas port to the desired 0.070” size. This is not a cut-down. It has all the Colt markings under the rail that you would expect from a Colt 10.3” factory barrel.  This barrel is an amazing piece of engineering, so we kept it true Colt through and through.  

All NFA laws apply.. If you are uncertain if you can own this, check federal National Firearms Act, also with your state authorities. I am not your lawyer. You need to make sure you can own it.

Note: All ITAR regulations apply. Charlie's deals in the real McCoy. Your item most likely has parts that cannot be shipped outside of the USA, or owned in the USA by non-US Persons. You take accountability to safeguard parts and the entire upper, and get necessary approvals to transport outside of the USA.