FN America FN 15 Guardian 5.56 NATO, 16 in, Mid-Length, Free-Float 15 in M-LOK — Customized with BATTLELINK Stock, Vertical Foregrip, and Bipod
This FN 15 Guardian is a recent-release, USA-made AR-15 platform rifle configured with a 16-inch 4150 CMV nitride barrel, a mid-length gas system, and a 15-inch free-float M-LOK aluminum handguard. This example stands out for its clean, very good overall condition, forward assist upper, and thoughtful user-added upgrades including a BATTLELINK collapsible stock, a tan vertical foregrip, and a folding bipod.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minor handling marks are present from previous use. This rifle is currently fitted with a Palmetto State Armory bolt carrier group. The bore is bright and clean. See photos for additional detail.
What’s Included
- BATTLELINK collapsible carbine stock (installed)
- Polymer vertical foregrip (tan), installed on M-LOK handguard
- Folding bipod mounted under handguard (installed)
- 1x 30-round polymer magazine marked "300 BLK"
Built on forged 7075-T6 aluminum receivers with a Type III hard-coat anodized finish, the FN 15 Guardian delivers a durable foundation with clean rollmarks: the upper is laser-marked "FN 15 GUARDIAN," the lower reads "MODEL FN15 • CALIBER MULTI," and the right side is marked "FN • COLUMBIA, SC."
The 16-inch 4150 CMV barrel features a button-broached, QPQ nitride treatment and a hybrid profile with a 1:7 RH twist to stabilize a wide range of 5.56 NATO projectiles. It is threaded and capped with an A2 flash hider. A mid-length gas system with a low-profile gas block supports smooth cycling.
The free-float 15-inch aluminum handguard provides a continuous 12 o’clock Picatinny rail with M-LOK slots for mounting accessories. This rifle arrives configured with a tan vertical foregrip and a folding bipod already installed, offering immediate stability options.
Ergonomics include a BATTLELINK-branded telescoping carbine stock and an FN-logo textured polymer pistol grip. This example has a forward assist, a feature not found on some early Guardian uppers.
Controls and internals include a semi-automatic, direct-impingement action with a single-stage MIL-SPEC trigger. The rifle is listed at approximately 6.6 lb unloaded and ships with one 30-round magazine.