Brownells 75th Anniversary - A Shooting Heritage

Solid Foundation For Building An Ultra-Light .308 Rifle

The Polymer80 .308 80% Polymer Lower Receiver & Jig gives you a head start on building your own super-lightweight AR-style .308 rifle. Receiver is constructed from a single block of proprietary polymer composite that is 80% finished and requires final milling of the fire control group, trigger pin, hammer pin, trigger slot, and safety selector.

The Polymer80 .308 80% Polymer Lower Receiver & Jig lets you produce a DPMS-pattern lower receiver. The included jig system provides everything you need to complete construction, including an insert for trigger hole drilling, all the necessary drill bits, and the end mill bit to finish your lower.

  • Receiver is made from a single block of super-strong injection-molded hard polymer
  • Beefed-up buffer tube ring
  • Strengthening ribs across entire upper surface
  • No-thread pistol grip area
  • Reinforced magwell
  • FFL is NOT required

The Polymer80 .308 80% Polymer Lower Receiver & Jig Kit qualifies as a "receiver blank", as defined by the ATF. It has not yet reached a stage of manufacture that meets the definition of firearm frame or receiver found in the Gun Control Act of 1968 (GCA), so an FFL is not required for purchase.

Returns will not be accepted once the receiver is modified in any way. All warranty issues will be directed to the manufacturer.


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