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he major standout of this build is the complete KP-15 SLT/Ambi polymer receiver from KE Arms. Featuring an integral A1-length buttstock, the KP-15 addresses a common weak point with other synthetic receivers — namely, breaking right where you attach your receiver extension tube and buttstock. While it may seem strange to rock a fixed stock in absence of a federal assault-weapon ban, the A1 length is fairly