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MK112 Mod 1 Rifle

Primary Weapon Systems (PWS) MK112 300 Blackout
Primary Weapon Systems (PWS) MK112 5.56 / AAC 300 Blackout

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Primary Weapon Systems (PWS) MK112 5.56 / AAC 300 Blackout

List Price: $1,799.95
Our Price: $1,749.95
Savings: $50.00

Availability:: Back Order
Product Code: PWS-MK112_MOD_1



PWS MK112 - 5.56 / AAC 300 Blackout

The MK 112 is Primary Weapon Systems's 12.5 inch short barrel AR15. The MK 112 is a piston driven system. The MK112 is offered in 5.56 / .223 or AAC 300 Blackout caliber. The MK112 is the only AAC 300 Blackout short barreled rifle that is available from PWS for sale. The MK112 features 1:8 twist rate barrel and is effective out to 450 meters.

The MK112 is another piston gas system that PWS has for sale. The PWS MK112 has an enhanced bolt carrier group system for the utmost reliability. The piston system was developed from the proven system of the MK107 and a mid length piston system. As with all AR15 rifles that PWS has for sale, the MK112 is equipped with an adjustable gas block which makes it ideal for suppressor use.

The MK112 ships with standard high quality accessories such as the PWS KeyMod Rail System, Magpul stock and grip, and Magpul MBUS Gen 2 Iron Sights. Even with the aftermarket accessories the MK112 is extremely light, a little over 6 pounds.

Primary Weapon Systems has a great reputation in the AR15 piston rifle market. Everything PWS sells is backed with top notch manufacturing and attention to detail. All our customers that make a Primary Weapon System purchase report back how happy they are with the products PWS has for sale.


The sale of any short barrel rifle is a regulated item by the National Firearms Act (NFA). A short barrel rifle is any rifle that has a barrel shorter than 16 inches. Please check with your local and state municipalities for any further regulatory requirements. It is the buyer’s responsibility to make sure they comply with all NFA rules and applicable laws.

The purchase of a firearm that is regulated by the NFA is easy to purchase but requires a little more paperwork and waiting period, all of which we can walk you through. Check out our article about this process and/or contact us for more information about purchasing a NFA firearm or suppressor.

Need a NFA Gun Trust to purchase this MK112 SBR? We have you covered without breaking the bank. Not to mention we will make the entire process as painless as possible.

PWS MK112 Features

  • PWS Forged Mil-Spec Upper and Lower Receiver
  • PWS Stainless Isonite Treated 1:8 Twist Barrel
  • PWS Enhanced Bolt Carrier Group
  • PWS KeyMod Rail System
  • BCMGUNFIGHTER™ Charging Handle
  • Magpul MOE® Stock and Grip
  • Magpul MBUS® Gen 2 Sights
  • Magpul MOE® Trigger Guard
  • Magpul 30 round PMAG®

PWS MK112 Specifications

  • Caliber: 5.56 / .223 or AAC 300 Blackout
  • Weight:
    • 5.56 / .233 - 6 lbs, 7oz
    • AAC 300 Blackout - 6 lbs, 3oz
  • Overall Length: 29.5"
  • Barrel Length: 12.75"
  • Muzzle Velocity:
    • 5.56 / .233 - 2833 ft/sec
    • AAC 300 Blackout - 2355 ft/sec
  • Muzzle Energy:
    • 5.56 / .233 - 1105 ft/lbs
    • AAC 300 Blackout - 1355 ft/lbs

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