Primary Weapons Systems MK111 PRO Complete AR-15 Upper .223 Wylde Gas Piston - 11.85"

Manufactured by Primary Weapon Systems
SKU: 19-PM111UA0B
MPN: 19-PM111UA0B
Manufactured by Primary Weapon Systems
2 Reviews
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Details

Details

The Primary Weapon Systems MK111 PRO Complete AR-15 Upper .223 Wylde Gas Piston - 11.85" is the ultimate solution for AR pistol or SBR builds that stand out from the crowd. This complete upper receiver from Primary Weapon Systems features a 3-position adjustable long stroke gas piston system, guaranteeing exceptional reliability and smooth operation.

Easily accessible through the free float M-LOK handguard, the gas block adjustment switch allows for quick customization with picatinny rails or M-LOK accessories. The 11.85" barrel is precision machined from 416R stainless steel and is chambered in .223 Wylde, ensuring impressive accuracy potential. It boasts a button rifled configuration with a 1:8 twist rate and includes an effective A2 flash hider.

The proprietary upper receiver is forged from 6061 aluminum, offering a sleek and streamlined design. It features an M4 flat top Picatinny rail for easy optic mounting. Despite using a proprietary upper and bolt carrier group, compatibility is maintained with standard AR-15 charging handles such as the ambidextrous Radian Raptor.

Features:

  • 3-position, adjustable long stroke gas piston system
  • Mid-Length piston system design
  • 11.85" barrel chambered in .223 Wylde
  • 416R stainless steel construction with Nitride finish
  • A2 Flash Hider for effective muzzle control
  • Button rifled barrel with a 1:8 twist rate
  • Proprietary slick side upper receiver and BCG
  • Forged 6061-T6 aluminum construction
  • Compatible with standard AR-15 charging handles like the ambidextrous Radian Raptor
  • 11" M-LOK free float handguard
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Specifications

Barrel ContourMedium
Barrel Length11.85
Barrel Material416R Stainless Steel
BrandPrimary Weapons Systems
ColorBlack
FinishHardcoat Anodized
Gas System LengthMid-Length
Gas System TypeLong Stroke Gas Piston
Handguard11 in M-LOK Rail
Muzzle DeviceA2 Flash Hider
Twist Rate1:8
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Ratings & Reviews

2 reviews

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Love it

by -

I love this upper. It makes a mean AR-15 pistol. Very accurate and very smooth. It gets hot fast, that the only mildly negative thing I have to say about it. The adjustable gas block is fantastic and easy to use. The Radian charging handle is a great feature. The long-stroke piston gives a little more recoil than the DI style, but it's nothing to write home about. All around this is my favorite upper receiver.

Favorite Upper for my SilencerCo Chimera

by -

Love this little guy, don't use it as much since the ATF outlawed a piece of plastic! BUt liked it a lot and may SBR it just to keep using it. Nice piston system.