Low-profile, steel gas block with integral aluminum flip-up front sight adds minimal weight and bulk to your rifle. Easy bolt-on design for simple installation; three hardened steel hex-head bolts clamp gas block to barrel. Dual ball-and-detent system locks sight tower securely in folded and deployed positions. Standard A2 front sight post adjusts for elevation. Gas block/base with bayonet lug is precision machined from 4140 steel, with manganese phosphate parkerized finish for added strength and wear resistance. Sight tower is machined from 6061 T6 aluminum and hardcoat anodized a matching dark gray. MI-FST fits AR-15/M16 with .750" O.D. barrel. Deployed height is the same as F-marked USGI front sights; regulated for rifle or carbine with 16" barrel. MI-AR10-FST fits ArmaLite® AR-10® rifles with 16" and 20" barrels with .750" O.D. at gas port. Tower is correct height to regulate with readily available, standard AR-15 rear backup sights.
SPECS:
Base – 4140 steel, Parkerized, dark gray finish. Sight Tower – 6061 T6 aluminum, hardcoat anodized, matte black. MI-FST – 23⁄16" (5.6cm) overall length, 7⁄8" (2.2cm) wide, 35⁄8" (9.2cm) high with sight tower extended, 27⁄16" (6.2cm) high with tower folded. 5.3 oz. (151g) weight. Fits barrels with .750" O.D. at gas block position. MI-AR10-FST – 113⁄16" (4.6cm) overall length, 3¾" (9.8cm) high with sight tower extended, 2½" (6.3cm) high with tower folded, 7⁄8" (2.2cm) wide. 5.8 oz. (164g) weight. Fits barrels with .750" O.D. at gas port.
Catalog page 14