Description
Product Description
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Description: ProMag Flip Up Gas Block Front Sight. The PM138 front sight body and stem are machined from T6 aircraft gradealuminum and type III hard anodized. Steel parts are machined, then black phosphated per mil-spec. Precision machined to fit dovetailed gasblocks meeting MIL-STD 1913 Picatinny rail specifications. The sight ismounted to the gas block via a locking bar and secured with a crossslotted, knurled thumb screw. The sight is adjustable for elevation, (aquarter turn) moving the point of impact 1.25 MOA (minute of angle) at100 yards. The front sight features straight protective ears. The sights’ stem folds up and towards the shooter to deploy. When in the upposition the sight is locked in place via a spring loaded plunger. Tofold the sight to the down position, depress the plunger and fold thesight stem forward. No permanent modification required for installation. All hardware included. The PM138 sight may be paired with model PM136,PM137, PM200 PM202 rear sights mounted to AR-15 / M16 flat top A3 upper receiver rifles and carbines.
