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Rainier Arms UltraMatch MOD 3 AR-15 Billet Ambi Lower Receiver

AR-15 Stripped Lower Receiver

As low as: $240.00
Out of stock

FFL Required Before Shipping.
Please have your dealer email a copy of their FFL to [email protected] or fax it to 253-218-2998, referencing your name and order number.

Rainier Arms Free Ground Shipping

Mod 3 Lower without QD. Compatible with PDW Stock

Our billet sets are CNC machined from solid billet 7075-T6 aluminum which is 70% stronger than the commonly used 6061 aluminum and finished with milspec hardcoat anodize to a surface hardness of 60 Rockwell. We have designed our lowers with an ambidextrous mag release and bolt release with extended latch for smoother deployment. The precision machining on our billets lowers will line up perfectly to our Rainier Arms UltraMatch Billet Upper Receiver or any other billet uppers out there.



  • Ambidextrous Extended Bolt Release
  • Ambidextrous Magazine Release
  • 7075 Billet Aluminum
  • Flared Magwell
  • Integrated Trigger Guard
  • Bolt Catch Threaded Pin
  • Tensioning Screw for proper Upper/Lower Fit
  • Compatible with 45° safety selector levers


Engraving Options:

  • WA - Auburn WA
  • KS - Wichita KS
More Information
Product Type AR-15 Stripped Lower Receiver
Manufacturer Rainier Arms, LLC
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