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  #1  
Old 08-25-2016, 08:41 AM
Riqrob Riqrob is offline
 
Join Date: Oct 2009
Location: Vancouver, WA
Posts: 314
Default Gas Cylinder Loose

I purchased an M1 Special about 5 years ago. I noticed that the gas cylinder was a bit loose, so I peened the splines to tighten it up. Now, after about 5 th rounds, the cylinder is again getting loose. Is this normal? Should I just re-peen the splines or could there be another problem and or solution?
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  #2  
Old 08-25-2016, 10:40 AM
lapriester lapriester is offline
 
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Location: Cobb, N California
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Are you taking the cylinder on and off for cleaning? Did you peen it enough to need to drive it on with a drift or block of wood? Stop taking oit on and off first of all. You don"t need to but once a year after shooting season. That is the number one cause for loosening. Do you use a GC wrench to secure it when you tighten the plug. That's number 2. If you didn"t peen it enough or evenly that's number 3.
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  #3  
Old 08-25-2016, 10:50 AM
TSimonetti TSimonetti is offline
 
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Location: Western Pennsylvania
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How are you peening them? My best results came after using a long oversize drill bit and laying it in the spline channel, then lightly tapping it with a hammer which slightly rolls over the entire edge of the spline on both sides. Make sure you do all of the splines.

+1 to lapriester as well.
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  #4  
Old 08-25-2016, 10:46 PM
la Fiere la Fiere is offline
 
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Location: Northern California - SF peninsula
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Just peen it again. If it lasted for 5,000 rounds I'm not sure you actually have a problem.
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  #5  
Old 08-25-2016, 11:12 PM
lapriester lapriester is offline
 
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Location: Cobb, N California
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Oh wow, did he say 5K rounds? I saw 5 th and wasn't sure what that meant. If it's taken 5K rounds to loose you did it right the first time. Just do it again.
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  #6  
Old 08-25-2016, 11:44 PM
Riqrob Riqrob is offline
 
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Thanks, fellers. I'll just re-peen. I don't take the cylinder off at all, hence my question.
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  #7  
Old 08-26-2016, 11:11 AM
Scout706 Scout706 is offline
 
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Location: Georgia
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Every 5th round would be a problem. can't figure out how to superscript.
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  #8  
Old 08-26-2016, 02:53 PM
glindes glindes is online now
 
Join Date: Mar 2014
Location: DE
Posts: 413
Default Shop Manual on GC peening

HTH
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  #9  
Old 08-26-2016, 03:46 PM
lapriester lapriester is offline
 
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Location: Cobb, N California
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Don't do it with a punch. It's often messy and does more harm than not if done improperly. I don't care what TM's say. Most are decades old and better methods have been devised to do it cleanly and effectively. I've seen peened splines done by early armories. Messy and makes it difficult to re-do with good results.
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  #10  
Old 08-26-2016, 05:08 PM
Orlando Orlando is offline
 
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Location: Ohio
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I agree with Larry that armorer peening looks messy but done properly with a punch you cant really tell. It only takes a light tap to roll the edge.
I used to peen mine with a socket etc but after doing enough of them I now prefer a punch. Neither one is right or wrong, just personal preference
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