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AR15Discounts has a great selection of Lower Build Kits. We have budget friendly kits starting under $80 and premium kits at competitive prices.
Aero Precision , Magpul , Dirty Bird Industries , B5 Systems , NBS
Discount Mil-Spec Lower Build Kit
Retro AR-15 A2 Lower Build Kit
Carbine Lower Build Kit Configurator
Dirty Bird SBA4 Lower Build Kit