Faxon Firearms set out to create a dependable and affordable 9mm PCC Upper that would be compatible with the widest range of 9mm PCC lowers and triggers. We’ve created the FX-916U featuring our 16” 9mm Tapered barrel, Gen 2 9mm Bolt Carrier Group, Enhanced Forged Upper Receiver, and Lightweight Gen 2 15” Aluminum handguard. The FX-916U is compatible with both Colt and Glock mag lower receivers and works with most binary triggers.  Technical Specifications 9mm SAMMI Faxon 16" Taper 9mm Barrel Faxon Enhanced Forged Upper Receiver Faxon 15" Aluminum Handguard Faxon Gen 2 9mm Bolt Carrier Group Includes 9mm A2 flash hider Tech Note- The Faxon FX916U is not compatible with Spike's Colt pattern lower receivers.