PWS MK1 Mod 2-M Lower Receiver with SBA3 Brace

You’re building an AR. Maybe it’s for practical shooting sports at a local range, a compact option for home defense here in the Philly area, or even as a possible addition to your hunting loadout where permitted under Pennsylvania law. Whatever the reason, you need a solid starting point – a good lower receiver.

PWS MK1 Mod 2-M Lower – Ready to Build

This isn’t just a bare receiver. The Primary Weapons Systems MK1 Mod 2-M lower comes set up as a pistol, including an SBA3 brace, meaning you’re ahead of the game right out of the box. It’s designed to be a reliable, complete starting point for your AR pistol build.

What You Get

• PWS Lower Receiver: Machined from 7075-T6 aluminum, this lower is built to last.
• Enhanced Trigger: PWS includes a PTFE-coated enhanced mil-spec trigger. You’ll find a consistent pull weight between 5.5 and 6.5 pounds – reliable and suitable for everyday use. No need to immediately upgrade just to get a usable trigger.
• Buffer System: Comes with a PWS enhanced H2 steel buffer and a matching buffer tube. The tube includes a ratchet lock castle nut and end plate set, plus a built-in Quick Detach (QD) mount for sling attachment.
• SB Tactical SBA3 Brace: The SBA3 provides a stable shooting platform while still allowing for the compact size of a pistol configuration.
• Bravo Company USA Pistol Grip: A well-regarded grip known for comfort and control.

Specifications

• Model: MK1 Mod 2-M
• Series: MK1
• Caliber: Multi-Caliber (Compatible with standard AR-15 uppers in .223/5.56, .300 Blackout, and others – *upper receiver sold separately*).
• Material: 7075-T6 Aluminum
• Trigger: Enhanced Mil-Spec (PTFE Coated)
• Buffer: PWS Enhanced H2 Steel

The MK1 Mod 2-M is a good choice if you want a quality lower receiver that’s ready to go with key components already installed. It cuts down on the parts you need to source and ensures everything works together from the start.

Important Note for Pennsylvania Residents: All firearms and lower receivers are subject to Pennsylvania state laws. We ship all firearms to a local FFL holder in Pennsylvania. We can assist with FFL transfers; please contact us for details. Buyers are responsible for knowing and complying with all local, state, and federal laws regarding firearms ownership.

FFL Transfer/Shipping: We are a Pennsylvania-based retailer and can only ship firearms to Pennsylvania addresses with a valid FFL license. All shipments require proof of proper identification and adherence to state and federal regulations.