 In fixed stock versions of the FAL, the recoil spring is housed in the stock, while in folding-stock versions it is housed in the receiver cover, necessitating a slightly different receiver cover, recoil spring, and bolt carrier, and a modified lower receiver for the stock.For field stripping the FAL can be opened.During opening the rifle rotates around a two piece pivot lock and pin assembly located between the trigger guard and magazine well to give access to the action and piston system.