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The RL556v3™ features Polymer80’s proprietary polymer composite, a solid core design, flared magwell, and beefier mil-spec buffer tube housing. The pistol grip area features a unique threadless design specific to Polymer80 rifle lowers.

The kit includes:

  • 80% Polymer AR15 Lower Receiver (Mil-spec)
  • Polymer Jig
  • Trigger Hole Drill Guide
  • Drill Bits and End Mill

The TacFire SS-RK556 rifle build kit contains- 16" 5.56 Nato, M4 contour barrel/nitride; birdcage flash hider w/crush washer; 15" MLOK free float handguard; AR15 5.56/.223/.300AAC stripped billet upper receiver w/M4 feed ramps/.556 Mil-Spec charging handle aluminum w/steel latch; dust cover; AR15 forward assist; AR15 standard receiver end plate; Mil-Spec/commercial castle nut/steel; buffer tube aluminum; AR 15 3 oz buffer w/tube spring; AR15 USA made lower parts kit and a AR15 standard A2 style black pistol grip/A2 style

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  • Short Round Supply Co. makes sure you won't find a better deal on your favorite shooting gear, firearms accessories, optics, or ammunition anywhere else.
  • Generally speaking, Short Round Supply doesn't require buying in bulk to get our best possible price. Here, we think you should be able to buy boxes of ammo at bulk pricing!
  • All ammo pricing is per the box. Any reference to a case is made for informational purposes only.  Bulk ammo deals requiring a minimum purchase will only allow the minimum qty of boxes to be placed in your Range Bag.
  • It is the Buyer's responsibility to ensure that any products are legal to own in your local area.
  • We cannot ship certain products to some locations. Please check our Terms and Conditions for a detailed list 
  • Unless otherwise noted above, this product is eligible for our SuperSonic Shipping Guarantee
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