Whether running them as your primary aiming system or relying on them as a back-up in case your main optic goes down, the Geissele Folding Sights will give you the performance you need and expect from a product designed and manufactured from the ground up in our facility located in North Wales, PA. The Geissele Folding Sights are made from 6061-T6 aluminum and are Type 3 hard coat anodized to ensure extreme durability. For optimal aiming precision, our sights can be adjusted at A 1/2" increments at 100 yards. The adjustments for the front and rear sights are captive to ensure that once sighted-in, there won't be any adjustments not intended by the user. There ar Mfg: Geissele Automatics