Primary Weapon Systems MK1 MOD 1-M Pro Complete Pistol Lower with SBA3 Brace

Manufactured by Primary Weapon Systems
SKU: 20-M100PM1B
MPN: 20-M100PM1B
Manufactured by Primary Weapon Systems
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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to



The Primary Weapon Systems MK1 MOD 1-M PRO AR-15 Complete Pistol Lower w/ SBA3 Brace offers an innovative and reliable design for your next AR pistol build. This complete lower by Primary Weapons Systems boasts the PWS patented enhanced buffer tube with 6-position settings, ratchet lock castle nut and end plate set with built-in QD mount. It is forged from 7075-T6 aluminum providing a durable base for any weapon build and boasts a hard coat anodized finish to withstand heavy use and abuse typical for the AR platform. It features a PTFE coated Mil-Spec enhanced trigger for dependable and repeatable operation. The MK1 Pro AR-15 lower ensures functionality and versatility with a tactical SBA3 brace and multi-caliber capabilities. This AR-15 lower receiver by Primary Weapons Systems is fully assembled from the factory with Mil-Spec parts and is designed to be as ergonomic as possible when paired with a complete upper receiver for optimal fit and performance making Primary Weapon Systems MK1 MOD 1-M PRO AR-15 Complete Pistol Lower a great option for your next AR pistol.

  • Manufactured by Primary Weapon Systems
  • Multi-caliber lower
  • 7075-T6 aluminum
  • Anodized hard coat finish
  • AR-15 compatible
  • Mil-Spec enhanced trigger
  • Trigger pull weight of 5.5 – 6.5 lbs.
  • PWS patented enhanced buffer tube 
  • QD mount
  • PWS enhanced H2 steel body buffer
  • SB Tactical SBA3

The mission at Primary Weapons Systems is to provide the highest quality tactical and sporting rifles and accessories for sportsmen, military, and law enforcement at a fair, competitive price.
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AssemblyComplete Assemblies
BrandPrimary Weapon Systems
Caliber MarkingMulti-Caliber
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154

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