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Posted: 8/26/2012 3:22:46 PM EDT
| So I want an adjustable gas block that is a regular sight too. JP makes one but not for a .625 barrel. Is it possible to take a drill, tap and set screw and make my own? |
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Anything is possible,if you have the rifle tools.
You can install the a needle valve in line with the tube behind the block, or just make a longer needle valve that installs from the front and constricts the gas tube side passage that way instead. It just comes down to making the needle valve, and machining the FSB for it. |
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I have an adjustable JP block. I wouldn't buy another one or recommend one. The adjustment is very nonlinear. Maybe one day I'll make another adjustment screw.
The gun is impossible to adjust for enough gas to operate, it's either shut off or over gassed enough to throw cases 15 feet from prone position. |
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I've made my own, not difficult to do if you have a small lathe and mill.
Used 17-4 SS and turned a set screw to make the needle valve. Knob has 12 grooves that mate to a 1/8 ball in the body to give click stops, one full turn is full open. The gas tube is silver soldered into a 1/2 rod that holds the needle valve. 
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Quoted:
I have an adjustable JP block. I wouldn't buy another one or recommend one. The adjustment is very nonlinear. Maybe one day I'll make another adjustment screw. The gun is impossible to adjust for enough gas to operate, it's either shut off or over gassed enough to throw cases 15 feet from prone position. The steel variants perform a little better and last longer than the aluminum version when you tune it to run with hand loads. Metering high pressure gas can't be done accurately with a set screw. All of the "adjustable" gas systems (i.e. Switchblock / PST) are gross adjustments. An adjustable gas system that isn't somewhat linear and adjustable on the fly is worthless... That being said, I did pick up a couple of the Syrac Ordnance adjustable gas blocks. I am going to run one on an SBR and the other on an 18" rifle. I don't expect them to run any better but who knows... |
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