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Gas piston question

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john843 View Drop Down
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Joined: Jan 29 2021
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john843 Quote  Post ReplyReply Direct Link To This Post Topic: Gas piston question
    Posted: May 27 2022 at 8:30pm
I've got a gas piston nut on an NPM shooter that is loose after shooting the rifle several times. It doesn't really back out and the gun has never malfunctioned. I've been snugging it down with a small wood block and brass hobby hammer but after firing it you can flick the nut around with your fingernail.
Didn't know if blue Loctite around the last couple of threads that contact might be an option or maybe a tiny spot of JB Weld in the staking recess (small enough to be removed easily) could work? One thing I know I won't be doing is to attempt to stake it. I have three usable barrels and would like to keep it that way!
Thanks for any suggestions,

John
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GotSnlB28 View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote GotSnlB28 Quote  Post ReplyReply Direct Link To This Post Posted: May 27 2022 at 9:05pm
I have used loctite blue and none have come loose in use. Clean/degrease the threads well. The piston wrench works well to snug tighten. That is my advice, there are strong opinions out there for staking I know, and may even follow mine. But I can tell you the blue loctite works well and you'll never see it or risk damaging the gas cylinder however remote that chance is for non-professional stakers.
I wouldn't use JB or epoxy.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john843 Quote  Post ReplyReply Direct Link To This Post Posted: May 28 2022 at 3:17pm
Thanks Joel, I'll open a new LocTite and give it a try. Before posting, I looked for any old threads relative to piston staking and found one Roger started but it was more to do with the fact that some later carbines were never staked. This one was staked at some point but the nut had been run past it prior to my receiving the rifle.

Thanks Again,
John
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W5USMC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote W5USMC Quote  Post ReplyReply Direct Link To This Post Posted: May 28 2022 at 3:43pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smtrico Quote  Post ReplyReply Direct Link To This Post Posted: Jun 20 2022 at 4:26pm
Try using the green Loctite instead of the blue.  Last year I bought one of the MidwayUSA carbines.  It had a stuck gas piston, which I got out be removing the piston nut, but then couldn't get it back in.  Took it to a gunsmith as the threads were all fouled up.  He fixed all that and put in a new piston nut.  Anyway, rather than restaking the piston nut, the gunsmith said he always uses the green Loctite.  It is stronger than the blue, but not quite as strong as the red Loctite.  The key, though, is that the green Loctite is formulated specifically to withstand very high heat and so it can handle the heat that is generated when you fire the rifle.  He said the blue Loctite may not last for that reason, but the green will. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john843 Quote  Post ReplyReply Direct Link To This Post Posted: Jun 21 2022 at 7:07am
Thanks for the heads up smtrico. I'm going to replace the piston nut on this same rifle with the type 2 (?) nut from Amherst since it already has a type 6 op-slide with the increased dwell and will definitely give the green LocTite a try.

Thanks Again,
John
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