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PSA MOE SBA3 Lower Build Kit

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Whether you're getting your stripped lower receiver ready to build an AR-15 pistol or just want to change things up and convert your SBR into a pistol, we've got just the kit for you. With the all-inclusive SBA3 lower assembly, you'll receive parts from popular and reliable brands. It includes Magpul MOE grip and trigger guard as well as the SB tactical SBA3 adjustable pistol brace. And of course, you get the rest needed for your lower assembly, such as the mil-spec 6-position buffer tube assembly kit, and a precisely crafted lower parts kit, all from Palmetto State Armory.

Note: Due to ATF rule 2021R-08F, any pistol with a stabilizing brace is considered a short-barreled rifle (SBR), and is therefore considered a National Firearms Act item requiring a federal tax stamp.

AR-15 Lower Build Kit: What's Included

Fire Control Group

  • AR-15 Hammer
  • Hammer Spring
  • AR-15 Trigger
  • Trigger Spring
  • Trigger/Hammer Pins
  • Disconnector
  • Disconnector Spring

Buffer Tube Assembly

  • Buffer Tube
  • Buffer
  • Buffer Spring
  • Castle Nut
  • Latch Plate
  • Buffer Retainer Detent
  • Buffer Retainer Detent Spring
  • SBA3 Adjustable Pistol brace

Takedown & Pivot Pins

  • Takedown Pin
  • Pivot Pin
  • Takedown Springs (3)
  • Takedown Detents (3)

Bolt Catch Assembly

  • Bolt Catch
  • Bolt Catch Detent
  • Bolt Catch Detent Spring
  • Bolt Catch Roll Pin

Safety Lever Assembly

  • Safety Selector
  • Selector Detent
  • Selector Spring

Installation Instructions

Follow our step-by-step picture and video guide to install your AR-15 Lower Build Kit. You'll also need some basic tools, like an Armorer's Wrench, and Roll Pin Punches with a Gunsmithing Hammer.

Guide: How to install the AR lower parts kit.

Completing Your AR-15 Build

Make finishing your AR-15 pistol even easier! Check out our available pistol barreled uppers.



WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to:

Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

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We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.