wing reinforcing plates
The BFA must be adjusted to fit the machinegun barrel. The orifice tube fits inside the flash suppressor, flush against the gun muzzle and flush with the forward end of the flash suppressor. The BFA is clamped tightly to the front sight. When properly adjusted, it will fit snugly against the muzzle, thus preventing the escape of gas during firing. When the BFA is manufactured, the distance the orifice tube screws into the restricter bushing is fixed and fitted by ''staking'' the restricter bushing. This fixed distance, set in the restricter bushing, does not provide the correct adjustment for every machinegun, because the distance from the muzzle to the forward end of the flash suppressor varies from gun to gun. It is necessary, in some instances, to break the "stake" mark, adjust the orifice tube to fit the gun barrel, and then restake it.
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