Barska AR Riser Mount, AW11143: * Raises mounting platform to 3/8" * Adds height to attach a scope or optic accessory * Plenty of slots for maximum scope ring adjustments * Peep sight design allows you to use rifle"s iron sight * Made from T6 aluminum * Durable even under the most demanding conditions * Weaver/Picatinny style flat top * 2 easy-to-use thumb lock nuts for quick installation * Rail length of 5.2"