FORWARD CONTROLS DESIGN
GBF Gas Block, .625" Journal
The GBF is a 0.625 gas journal low profile gas block, machined from heat treated 4140 bar stock and manganese phosphate coated. It holds tight tolerances to get as much seal as possible out of the design.
Also available in 0.750 journal. Measure your barrel's gas journal before ordering.
The Semi Blind Gas Tube Hole
The gas tube hole is semi blind, with an access port just large enough to pass a 3/32 punch. The point is to keep the gas tube hole as small as possible while still giving you a way to drive out a gas tube that carbon has locked in place.
The feature was suggested by the late Will Larson of Semper Paratus Arms.
Pinning and Set Screws
Bosses on both sides give a gunsmith an easy reference point for pinning the block to the barrel. Both 5/32 x 5/8 and 1/8 x 5/8 pins work.
Note that the .625 requires the pinning hole to be drilled differently than the .750. Have a gunsmith handle it if you are not set up for that work.
Set screws are spaced 0.450 inches apart. Torque the knurled set screws to 25 in-lb. A 3/32 wrench is required, and Rocksett is recommended on the threads.
On Weight
At 1.95 oz the GBF is not a lightweight gas block and was never meant to be. Material was removed where it adds weight without contributing to strength, which is where the sleek profile comes from, but strength and dependability came first.
Installing the gas tube roll pin on a low profile block is easier with a jig. The FCD GPT gas tube pin tool is built for it.
What's Included
1x Forward Controls Design GBF .625 Gas Block
1x gas tube pin
2x knurled set screws
Specifications
- Machined from heat treated 4140 bar stock
- Manganese phosphate coated
- 0.625 inch gas journal
- Weight: 1.95 oz
- Semi blind gas tube hole with 3/32 punch access port
- Pinning bosses on both sides
- Accepts 5/32 x 5/8 and 1/8 x 5/8 pins
- Requires a different pinning hole location than the .750
- Set screw spacing: 0.450 inches
- Set screw torque: 25 in-lb, 3/32 wrench required
- Rocksett recommended on set screws
- Made in USA
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