CM4 Complete 16in, 14.5in or 13.9in Lightweight Midlength CHF Upper with Low Pro Gas Block

Usually Ships in 2 to 4 Weeks
(3 reviews) Write a Review

Base Model Specs

*Due to the state of the firearms market, many of our options are out of stock and stock may fluctuate quickly. We are doing our best to keep option availablilty up to date, and what we show on the website as an option is all we have to offer. Occasionally, an option may sell out before we can update stock, and you will be notified of that so we can discuss alternatives. Thank you for your patience and understanding.*

--Centurion Arms 16" Lightweight Midlength CM4 5.56mm hammer forged barrel 1 in 7" twist extra thick chrome lining and barrel steel specifically engineered for machine guns for longer life (most all hammer forged barrels on the market are not made of this steel).
--Upper receiver is standard forged Mil-Spec with M4 Extended feed ramps
--Centurion Arms low profile pinned gas block
--13" MLOK Centurion Arms CMR Rail
--Mid-length gas tube
--Standard A2 Flash Hider

Options (when in stock, available, and compatible)

--14.5" and 13.9" Lightweight Midlength CHF Barrel
--Centurion Arms 9", 10", 12" C4 Quad Rail
--Centurion Arms 9", 10" & 15" MLOK CMR Handguard
--Auto bolt carrier group with MPI tested bolt
--Standard charging handle or PRI gas buster charging handle
--Surefire Warcomp, Surefire SMB Muzzle Brake, Centurion Arms 9315 Open (3 or 4) Prong Flash Hiders and Centurion Arms 6315 Stoner 63 Flash Hider
--Backup Iron Sights - Folding Micro Front and Folding Micro Rear (300M)

Price for Base Upper with Standard Specs $895.00

****Not all items shown in pictures are included with purchase. Uppers may be shown on lowers as full rifles.****


  • 5
    CM4 Upper!

    I just received my CM4 upper from Centurion Arms. This is the 3rd complete upper I have purchased from then, as well as 6 complete lowers. The quality of this upper is outstanding! I specified this upper with the C4Mlok 12" rail and it is very impressive. Definitely made the right choice there. You just can't go wrong with Centurion Arms. High quality products, great service, and fair prices. Centurion Arms is my go to place for AR firearms and accessories.

  • 5
    Top Tier Upper

    This is my first Centurion Arms complete upper and I could say after taking a class and fortunately being able to shoot hundreds of rounds through it that its very very good. The fit and and finished is comparable to top tier manufacturer if not maybe better. I'm looking forward to getting a 10.5 upper in the future from Centurion Arms. Would highly recommend this upper and would not hesitate to purchased anything coming from Centurion Arms. Very impress. Thank you Corrie and Monty for making quality parts and building top end rifles.

  • 5

    I had a lower with a lot of sentimental meaning to me and I wanted an extremely high-quality, working upper to match it with. Having been fortunate enough to train and work with people who know Monty I knew I'd be in good hands with a Centurion upper. I had a special request with my build which Centurion quickly and graciously accommodated. Communication was great. Finished product is still pretty new to me but is incredibly well balanced, was super easy to zero and shoots without issues. Will definitely look to CA in the future for any parts / components.