Welcome to the NEW Cheaper Than Dirt online store! Same great prices and availability, now optimized for your mobile phone!
Previous | Next

CMMG AR-15 MK4 RCE Complete Upper Receiver .223 Rem/5.56 NATO 16" Barrel RKM14 KeyMod Hand Guard SV Muzzle Brake Matte Black 55B5949

CMMG, Inc.
Ships from Warehouse 2
Typically ships within 1 to 2 business days.
Add To Wishlist Tell A Friend
Can we ship this to you?
CMMG is a leading manufacturer of AR-15 and AR-15 related accessories. CMMG's commitment to quality and creating product at the best value at the best price is unmatched. This complete upper receiver is designed to connect seamlessly with your existing AR-15 or AR-15 pattern lower receiver. For your convenience, a bolt carrier group is included and everything on this complete unit features a matte black finish.

Specifications and Features:
CMMG Complete Upper Receiver 55B5949
5.56mm NATO (accepts .223 Remington)
16" 416 stainless steel medium taper profile
Threaded 1/2x28
RKM14 KeyMod hand guard
Forged 7075-T6 Aluminum M4 Type Upper
CMMG SV brake
Bolt carrier group
Charging Handle
Matte black


Item#: ARR-118-022,2-CMMG55B5949
Total number of Reviews: 2

Submit a review

5.0 5
"Excellent fit and finish on this upper. I placed it on a dpms lower with no problems. Added all my extra goodies with no hang ups. Just waiting to get some range time!"
5.0 5
"I bought a Bushmaster A2S carbine used and attempted to install a rifle length handguard and low profile gas block on it.. I ended up going to a gunsmith who, in short order told me that he'd broken my upper.. What to do? Enter CMMG.. This upper is absolutely fantastic.. Perfect fit and spectacular quality.. Love the weight AND the looks too.. I would recommend this upper to ANYONE.. It is EXACTLY what I'd hoped for and is definitely worth the price.."