FN America FN15 16 Carbine Upper (HF Barrel) 36426 Folding Knife and FirePro goggles

and FirePro goggles

snag-free folded height

Integrated recoil lug

What lock type does this model use and is it secure for duty tasks

US Patent: 9

FN America FN15 16 Carbine Upper (HF Barrel) 36426 Folding Knife and FirePro gogglesFN America FN15 16 Carbine Upper (HF Barrel) 36426 FN 15 Upper Receiver Assemblies are meticulously built in FN's Columbia South Carolina manufacturing facility alongside US Military contract M4 rifles. Each upper receiver is supplied with and M16 style Bolt Carrier Assembly with properly staked gas key and Carpenter 158 Magnetic Particle Inspected (MPI) bolt, charging handle and FN's venerable cold hammer forged barrel.