The Gen 2 was redesigned with interlocking clamps for an extremely secure fit on mil spec and commercial buffer tubes. Installs in seconds with no weapon disassembly or modification. Fits all collapsible stock AR15 / M4 models with a mil spec (1.14 in dia) or commercial (1.17 in dia) buffer tube. The Gen 2 Z-360 is not compatible with non mil standard buffer tubes (i.e. pistol buffer tubes, Colt Canada Buffer Tubes), non mil standard receiver end plates (i.e. QD receiver end plates), ACE SOCOM stocks, the Smith & Wesson M&P15-22, the Smith & Wesson M&P15, and the HK MR762.
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