FN15 18" Upper Assembly. This Upper Assembly is in the M16 style. The SSM M-Lok 15" Rail allows for flexible accessory mounting with M-Lok accessories and rail attachments.
FN15 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 a M16-style Bolt Carrier Assembly with properly staked gas key, charging handle, and FN's venerable cold hammer-forged barrel.