Utilizing the LMT® patented Monolithic Rail System, MRP™. The one true monolithic rail System, milled from an individual strong bit of aerospace aluminum forging. It utilizes two locking bolts available through the side from the receiver to lock within the barrel extension. Age Restriction Thanks in your fascination in lmtdefense.com. https://alexishfdzw.blogitright.com/31427327/detailed-notes-on-buy-mars-rifles