The BM-s Accessory Mount allows the end user to be able to mount their preferred forward accessories to their AKM spec barrel. With a .59" Diameter, this accessory mount will allow the use of any attachment that accepts picatinny style mounting. Weighing in at just 0.8oz" this mount will completely change how you see this classis firearm of the past.Features :AKM Spec (.59) Accessory Mount,Common Usage: AKM type rifles with 0.59" diameter barrels,Product Dimensions: 1.57 x 0.84 x 1.26 inchesWeight: 0.8 oz