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Help with Gas Piston Nut staking |
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sling00 
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Joined: Apr 21 2016 Location: Tennessee Status: Offline Points: 941 |
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 Topic: Help with Gas Piston Nut stakingPosted: May 15 2017 at 8:37pm |
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The gas piston nut stake marks on my CMP mixmaster don't aligned with the nut indents. (Looks like one partial?) I'm guessing it was probably replaced at the CMP. I would appreciate some feedback if it's OK as is.
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bonnie
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Joined: Aug 28 2016 Location: N.C. Status: Offline Points: 89 |
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Posted: May 15 2017 at 10:11pm |
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From what I can see it does appear very little of the punch mark is holding the nut in place.
I would make sure the nut is tight, then re-stake it properly and be done with it. Just had a recent new to me carbine, poorly staked as yours appears to be, and it became loose after just firing a few magazines. |
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W5USMC
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Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2959 |
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Posted: May 15 2017 at 10:51pm |
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The gas piston nuts on the carbines that I shoot most often are no longer staked, I usually don't shoot more that a couple hundred rounds at a time and I check the nuts when cleaning, I have not had any come loose, I would imagine if that is your concern you could use some Lok-Tite blue on the threads.
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Wayne
USMC Retired NRA Life Member |
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sling00
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Posted: May 16 2017 at 12:33pm |
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The nut was tight as is so I gave it a smidgen of a tap with a center punch adjacent to the stake mark that's half in line with one of the nut recesses. It's a good reference/match mark and I'll keep an eye on it. If it loosens I'll give 'er another whack. Thanks for the input.
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New2brass
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Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4661 |
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Posted: May 16 2017 at 12:56pm |
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http://www.uscarbinecal30.com/forum/ps-magazine-the-preventive-maintenance-monthly_topic2826.html
read down to 1961 and the gas nut
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m1a1fan
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Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Posted: May 16 2017 at 5:53pm |
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Wonder if how many times the nut is staked is manufacturer specific. Have seen a few examples of not staked, single staked but no multiple stakes so far. Just give it a twist till tight usually does the trick.
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sling00
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Posted: May 16 2017 at 6:20pm |
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That's interesting reading. Couldn't find anything in the NLs although it may be in there somewhere. Good news is no more "whacks" required. Something else to make note of somewhere. Thanks!
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Charles
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Joined: Mar 21 2016 Location: Maryland Status: Offline Points: 587 |
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Posted: May 17 2017 at 3:30pm |
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Reading this post and others I have discovered there are two types of piston nuts, three and four lugs. Has any mention of this been written about? Who used what and when?
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Charles
Co B 1st Batl.115 Inf. Reg. 29th. Divi. 4.2 Heavy Mortar Co Retired Life member NRA |
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floydthecat
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Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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Posted: May 17 2017 at 4:11pm |
 I'm old enough to be day-dreaming by accident....but I think I've seen a picture of a piston with two lugs. Looks like is just has a big screwdriver slot in it?EDIT..... Nope was not day-dreaming. I found the site and the picture. Supposedly a Howa. |
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Charles
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Posted: May 17 2017 at 9:01pm |
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That makes three.
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Charles
Co B 1st Batl.115 Inf. Reg. 29th. Divi. 4.2 Heavy Mortar Co Retired Life member NRA |
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New2brass
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Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4661 |
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Posted: May 17 2017 at 9:14pm |
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look through the commercial carbine section for the 4 lug, it is not USGI. Why? it is easier to machine.
There are early USGI 3 Lug nuts , but you can only tell once it is out. I do not pulling them to check.  As to staking from factory, yes there is some info in the newsletters. check manufacture updates. I think one company did triangular punches. Something about staking in a specific "o'clock" position also. I too have seen unstaked. Why? dunno |
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grump09
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Joined: Aug 10 2017 Location: Liicoln Me Status: Offline Points: 2 |
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Posted: Aug 13 2017 at 1:32pm |
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The nut on mine backs out in 10 rds or so. Attempted to stake it so will see what happens next session Will try the Loc-Tite next.
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Moose Foot
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bonnie
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Posted: Aug 13 2017 at 5:13pm |
grump09, Replied to your thread that was posted in the maintenance section before seeing it here. |
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grump09 wrote: