The XBL improves the bolt lock back function by offering an extended and widened profile. It makes the lock easy to find by feel with either hand from either side of the gun. Reduces jam clearing time by holding the bolt open after magazine has been removed. Easier and more comfortable gun clearing and flagging for competition use. It installs in minutes and only requires the stock to be removed. Has been tested with the factory stock, Tandemkross Upriser, and aftermarket flared magwells and has proven an improvement in operation on all Ruger PCC platforms.