The bag stop was designed to give shooters the ability to "load" into their shooting bag while also preventing any contact to the mag which can cause feeding issues for the rifle. This is especially helpful for 22LR actions to feed reliably.FeaturesMounts directly to a variety of Arca clamps sharing the Arms17s hole spacingLow ProfileQuickly remove or attach when neededMachined from 6061 aluminumBlack anodize finishLength designed for standard 10 round and extended magazinesTwo threaded 10-32 holesWeight - 2.5 ounces without an Arca Clamp