Forward Controls Design .750 Gas Block

Original price was: $60.00.Current price is: $57.00.

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SKU: GBF UPC: 682157948628

Product Description

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 we can from the design. GBF’s gas tube hole can be described as a 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 a 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 5/32×5/8 and 1/8×5/8 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’ 750 dimpling jig.

GBF isn’t meant to be a lightweight 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 strength and reliability.

A gas tube pin, two knurled set screws are included (3/32 wrench is required.) Threadlocker is recommended for the set screws.

Torque value for knurled set screws: 25inch/lb.

Proudly designed and made in the USA.




Technical Information

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Firearm Compatibility

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit

Customer Reviews

Based on 5 reviews
Jason L.
Best for cross pin

I 3d printed a special jig to cross pin these gas blocks. Pinning is best! The flat boss of this GB works better than anything out there right now!

FCD Gas Block

Fit and finish looks great.

Costs a little more, but worth it.

My favorite gas block. The flats on the sides make it super easy to drill and pin with very few specialty tools.

Chance C.
Love it

Tight tolerances, exactly what I needed

Ian B.
Top quality, as expected from FCD

So far it seems FCD just can’t make a bad product. Like everything else this gas block works just as it should without and frills or marketing hype. I prefer the phosphate finish as well. Buy with confidence from FCD and Milspec Retail!