This Score High Shot Loading Block will work with any rifle/chassis that excepts AICS 308 size magazines. These blocks are CNC machined from black Delrin and utilize a very robust stainless steel latch that will never wear out. No more scratched cases, no more battered bullet noses, No more fumbling around trying to load your detachable magazine fed bolt action rifle one round at a time. You simply insert the Single Shot Magazine Block in your magazine well. There it serves as a tray that positions the cartridge directly in line with the chamber for smooth, trouble free loading. This item is a must for any serious shooter that requires the utmost accuracy from their rifle. No gunsmithing or alteration required. simply insert the Single Shot Magazine Block just like you would your regular magazine and that's all there is to it. Compatible withRuger Precision RifleMagpulMDT ChassisJ.AllenMcReeRock SolidXLRAll M5 Style detachable bottom metal for AICS SA 308Many more