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These are two variants of Hoffman Tactical's lower receivers I have been messing around with. The PoS-15 is a remix of his supper lower with a monolithic pistol grip and set up to use KE Arms pins. The PoS-?! is a cut down version of the BRN-180 monolithic using a .22 conversion bolt, it's also using KE Arms pins. Both are quite unnecessary but are great range toys.