View Full Version : Carbine gas plug problem.
After checking all other possibilities to find a reason for my carbines NOT SO GREAT performance, I pulled the gas plug and piston. It was staked and did come out with a lot of effort. The proper wrench was used. After checking and cleaning , I reinstalled the piston and plug. It now only threads in about 2/3 the depth it was before. The plugs threads look OK, while the threads on the barrel look to be slightly off the mark at the stake. Can these fine mchine threads be retapped? What size would these threads be? What would be the proper way to test the operation of the piston pryor to firing it? I hope someone can help. Thanks
What sort of malfunction is the carbine doing?
And to answer your questions.
1) 1/2-32 bottoming tap to chase the threads.
2) Stick a finger in the chamber to plug it, wrap your lips around the muzzle and blow/suck and the piston will move out and in. It is normal to have a carbon build up around the piston/nut and when you blow the piston might move just a little bit which is normal.
...that's why everyone says not to fart with it unless you absolutly have to. You can strip threads , and , if not careful , crack the gas block by overtightening. That being said , usually if the stake interfears with the threads the nut will strip first as it is softer. They made it that way because it is easier and cheeper to replace. I'd gently try a new nut. Buy two.
The threads can be retapped , and if you need to do that I can get the size for you. It is a special thread available from the very big tap and die stores on the internet , you'll not find it in a small town nor at your corner parts store. Be careful , if you cross thread it or crack the block , you are looking at a barrel replacement , go slow.
It should move freely when totally clean , use a magnet on a screwdriver to push in and out. Remember though , the piston gets whacked in by the slide returning to battery , and blown back by tens of thousand of pounds of preasure , so even a "sticky" piston usually functions fine.
ScottR and emmagee1917...thanks. I'm going to try the replace the nut suggestion. I'm not familiar with this type of tap. I've used taps in my work but on a much larger scale. I'm quite familliar with the "PING" sound of disaster. Again...Thanks...D
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