SMOS / CMMG 4.5" AR15 22LR Complete Billet SBR / Pistol Upper

SMOS Arms / CMMG Complete 4.5" Dedicated 22 (22 LR) SBR / Pistol AR15 Upper.  Suppressor Ready!  The highest fun factor of any AR15 configuration on the planet!  We also have the CMMG auto trip kits if you have a machinegun lower you want to use it on.

• SMOS (Subborn Mule Outdoor Supply) GFY billet upper receiver with SMOS sexy flat dust cover.
• CMMG 4.5" 1:16 barrel with satinless bolt and collar.  Muzzle threads 1/2x28x.400
• SMOS 6.5" Crossbreed M-LOK Rail
• Inside diameter of rail is 1.32"
• SMOS flat billet dust cover
• Bravo Company / VLTOR Gun Fighter charging handle w/ med. latch
• 35 oz
• 6" suppressor extends past the rail 2.25"
• Takes Black Dog magazines which are available in 10, 15, 25, 26, and 50 rd capacities
• Shoots the Wal-Mart bulk pack Federal ammo very well and it is mostly subsonic from this 4.5" barrel.  

Suppressor in photo is a Silencerco Spectre which is 6" long and 1.06" diameter. Suppressor, lower, and Maxim CQB Stock NOT included. 

This upper will work on any AR15 small pin lower. 

ALL NFA RULES APPLY

Tips for ensuring the dedicated AR15 22LR upper runs reliably / without malfunctions:

• Clean the chamber.  Many folks clean the chamber but not near thoroughly enough.  If you are having stovepipe issues or extraction and/or ejection issues, a dirty chamber is likely the cause.  Put a 22LR bronze/brass bore brush soaked in your favorite solvent on a cleaning rod and chuck the rod in a cordless drill and let it spin for 30-45 seconds then clean out with a q-tip or cotton patch.
• No notched hammers
• Trigger group must have at least a 3.5# pull -- else you are likely to have light strikes
• AMMO:  Remington does not work well.  CCI, Federal, and Winchester work the best
• Subsonic use
• Subsonic ammo should be fine with suppressor attached.  Without suppressor your mileage may vary.
• If having short stroke issues – remove ½ coil from the recoil spring at a time until it works.  Every spring is different.  Some springs might not need any coils removed and others might require 4 coils.  So cut off ½ at a time until it works.
• Magazines.  Black Dog magazines are great.  If you have ammo that noses into the chamber and doesn’t go in, they you probably need to put the stiffer spring in the magazine so that the follower gets that round up quicker.  This addresses *feeding* issues only – not extraction/ejection issues.  So if you are not having feeding issues, don’t change the spring in the mag.