Quoted: A corroded grenade launcher gas valve is a BIGGER problem. A lot of these short stroke.
Dennis Jenkins
Quoted: I've always wondered if the bores in these things are total crap, seeing that they weren't chromed lined and had a ton of corrosive shot through them.
-mark
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Dennis is 100% right. Years of shooting corrosive takes its toll on the gas valve, and finding a new one is next to impossible. I have had 2 that exhibited gas leakage at the valve and they did short stroke.
However, it's curable. If you take the gas tube off, and the valve nipple is corroded or looks like its not sealing (you'll get blow-by around the valve), then here's what you do:
1. Take a piece of .45 brass, and use a dremel cutoff wheel or wire saw and cut a piece out of it about 1/16 to 3/16" wide. You want a small "ring" that will act as a gasket over the nipple.
2. File and make the ring smooth and consistent (easy way is to take the cut edge and rub it over some emory cloth).
3. Take a propane torch, and heat the ring until it's just slightly glowing red, then dunk it in some water or oil to quench. After doing this (annealling), it will be very soft. If you heat it too much, it'll break so experiment to find it out.
4. Now, push the ring over the nipple, you'll have to force it on there, but it'll go. Then, push the gas tube onto the nipple/brass to seal up the leaking nut.
This works great, both my bad shooters now run 100%.