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-910U featuring our 10.5” 9mm Tapered barrel, Gen 2 9mm Bolt Carrier Group, Enhanced Forged Upper Receiver, and Lightweight Gen 2 9” Aluminum handguard. The FX910-U is compatible with both Colt and Glock mag lowers and works with most binary triggers.  Technical Specifications 9mm SAMMI Faxon 10.5" Taper 9mm Barrel Faxon Enhanced Forged Upper Receiver Faxon 9" Aluminum Handguard Faxon Gen 2 9mm Bolt Carrier Group Includes 9mm A2 flash hider Tech Note- The Faxon FX910U is not compatible with Spike's Colt pattern lower receivers.