Colt AR15/M4 Mil-Spec Lower Parts Kit September 22, 2018 Reviewer: Marty from West Covina , CA United States I was working on completing an Mk12 Mod 1 (M16A1 profile) lower receiver and needed the Colt LPK to complete the assembly. This is a genuine Colt LPK that includes every piece required to complete the assembly. AU has the best price, fastest shipping and no tax. They are hard to beat and that's is why I turn to them for Colt products. I am a repeat customer and have purchased complete Colt rifles, lower receivers, bolts, weapons lights, optics and accessories.



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