A: Rock solid fit. 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 known standard AR15 / M4 mil spec (1.14" dia) and commercial (1.17" dia) collapsible stock models and is known to be compatible with the following weapons: HK 416, Sig Sauer 716, Smith & Wesson M&P15 (AR15/5.56) models, the Law Tactical Folding Stock Adapter, and weapons equipped with a Vltor A5 buffer tube (with minor modification). 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, and the HK MR762.
Thanks for the inquiry.