Riser Mount

Mounted flat on the rail, a low optic can sit noticeably below where the eye naturally lands with the stock shouldered properly, forcing an awkward head lift to see through it; a riser lifts the whole optic to close that gap, a concept usually called co-witness height when matched to iron sights below it.

Getting riser height right — often described in absolute or 1/3, 1/2, lower-1/3 co-witness terms — is one of the more overlooked accuracy factors, since a mismatched height forces an inconsistent cheek weld that changes point of aim slightly shot to shot depending on head position.

A quick way to check height without measuring is closing both eyes, shouldering the gun naturally, then opening them — a correctly set riser puts the reticle right where the eye lands with no head adjustment needed at all.