FNH USA FN 15 Custom AR-15, 5.56 NATO, 18 in Stainless Bull Barrel, Knight's Armament Free-Float RAS, PRI Gas Buster, A1-Length Stock, Includes PMAG D-60 and KAC Bipod
This custom AR-15 pattern rifle is built on an FN 15 lower and configured for stability and control. It features an 18 in stainless heavy/bull barrel that is free-floated under a Knight's Armament SR-15/16 Free Floating RAS (PN 21318), plus a barrel-mounted weight/recoil reducer and a two-chamber muzzle brake/compensator. A PRI Gas Buster charging handle, fixed A1-length stock and A2-pattern grip, and a flat-top upper with Picatinny rail complete the build. It ships with a Magpul PMAG D-60 drum and a Knight's Armament rail-mount bipod.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm is in great shape overall. Minor superficial scratches and blemishes are present.
What's Included
- Magpul PMAG D-60 drum magazine
- Knight's Armament rail-mount bipod (NSN 1005-01-468-0350), installed
- Knight's Armament SR-15/16 Free Floating Rail Adapter System (PN 21318) with KAC ribbed rail panels, installed
- PRI Gas Buster charging handle, installed
- Two-chamber muzzle brake/compensator, installed
- Knurled barrel-mounted weight/recoil reducer, installed
This custom build starts with an FN-marked lower receiver rollmarked 'MODEL FN15', 'CALIBER MULTI', and 'FNH USA LLC, Fredericksburg, VA' with the FN oval. The direct-impingement system runs on a flat-top upper that includes a full-length Picatinny rail, forward assist, and ejection-port cover.
The 18 in stainless steel heavy/bull barrel is free-floated for consistency and uses a low-profile gas block positioned in front of the handguard (rifle-length gas position). The aluminum quad-rail handguard is outfitted with KAC ribbed rail panels.
Recoil and muzzle movement are addressed with a knurled barrel-mounted weight/recoil reducer and a two-chamber muzzle brake/compensator. The PRI Gas Buster charging handle features a gas-venting design and is marked U.S. Pat. 6,311,603.
Furniture includes a fixed A1-length buttstock with a 12.75 in length of pull and an A2-pattern pistol grip. A Knight's Armament rail-mount bipod (NSN 1005-01-468-0350) is installed for immediate support at the bench or prone.
Capacity with the included Magpul PMAG D-60 drum is 60+1 as stated, aligning with the rifle's flat-top, rail-equipped configuration for accessory setup as needed.



