Forward Controls Design GBF .750 (Gas Block Forward Controls)

GBF (Gas Block Forward Controls) is a 0.750 gas journal gas block done FCD way: meticulously designed and machined, with thoughtful features throughout. Machined from heat treated 4140 bar stock, GBF is manganese phosphate coated, GBF holds rather tight tolerances to squeeze every bit of tight seal they can from the design. GBF's gas tube hole can be described as semi blind hole, in that it has an access port just big enough to allow a 3/32 punch to go through. This feature was suggested by the late Semper Paratus Arms owner and operator, Will Larson, its purpose is to minimize the gas tube hole as much as possible, while providing a means for users to use a punch to dislodge an recalcitrant gas tube that's been fixed in place by carbon. Another useful feature is the bosses on both sides of the GBF to give gunsmiths an easy reference point to pin the GBF to the barrel. Both 5/32x5/8, and 1/8x5/8 pins can be used to pin the GBF to the barrel. Its set screws are 0.450 apart, which is com