RCM’s Long Action 20 MOA Rail is machined from 6061-T6 Aluminum and Hard Anodized per Mil-8625. It has the 20 MOA designed right in it to give you that extra long range capability. Both ends have 1/8 dowel pins pressed in them allowing a perfect and secure mount to our receiver. Also we had over sized 8-40, #15 Torx Head Screws cold forged to secure the rail down without any chance of coming loose. One of the best and most secure mounting systems on the market. Some old school snipers firmly believe that by bridging the front of the receiver to the rear with a rail will greatly reduce stress on the scope tube while shooting.