GBF (Gas Block Forward Controls) is a 0.750 gas journal gas block
done FCD way: meticulously designed and machined, with thoughtful
Machined from heat treated
4140 bar stock, GBF is manganese phosphate coated, GBF holds rather
tight tolerances to squeeze every bit of tight seal we 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
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
compatible with one of the set screw spacing options on the popular SLR
Rifleworks's .750 dimpling jig.
GBF isn't meant
to be a light weight gas block, we prefer strength and dependability
over any ever changing fad. GBF's sleek appearance is the result of
removing material that adds weight but doesn't contribute to the
strength and reliability.
A gas tube pin, two
knurled set screws are included (3/32" wrench is required.)
Torque value for knurled set screws: 25inch/lb.
Proudly designed and made in the USA.