The "standard" FNG-15: M4 6-position stock, M4A2 grip, forged upper and lower receivers, 7075 T6 aluminum, UR flat top picatinny rail w/ M4 feed ramps, Magpul MOE M-LOK drop-in handguard (or similar), 16" barrel chambered in 5.56mm, 1:7 or 1:8 twist, carbine length gas tube, picatinny top (bottom) gas block, A2 muzzle device.