The gas cylinder has just a little play in it and was wondering how to tighten it up? The movement lets the front sight shift left to right with the twisting of the cylinder. I'd like to keep the parts with the worn look so is it normal and (which I assume it's not normal) if it's not how would I fix it. Thanks in advance
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Loose gas cylinder
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The most common way to tighten up the gas cylinder is to peen the splineways in the barrel. However, one thing that you almost never hear anyone mention, and this goes for the M14 as well, is that if you peen the splineways you will need to re-zero the sights. It's nearly IMPOSSIBLE to peen the splineways in such a manner so they're perfectly centered. In other words, you'll undoubtedly create a small degree of cant so that the front sight will need to be readjusted ever so slightly. Of course, the longer the distances the more pronounced this will be.....and under 200 yards it will probably be a non-issue altogether, but it's worth mentioning!!Welcome to the Addiction!
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Originally posted by Pitbulz21 View PostWould purchasing a newer gas cylinder fix the problem, or is it normal to peen the barrel?Welcome to the Addiction!
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Originally posted by Pitbulz21 View PostWould purchasing a newer gas cylinder fix the problem, or is it normal to peen the barrel?
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I find that most of the time its the barrel splines that are worn not the cylinder. Peen the splines as a new cylinder may not help fit. Spline peening is easy to do , it takes a light hand, no need to whack the barrel. If dome properly most people wouldnt even be able to see it as done
I also find its best not to peen the first 1/8 inch of the splines. It makes it much easier to get the cylinder to start onto the pads
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Originally posted by Pitbulz21 View PostOk guys i got around to peening it tonight. I didn't do much just one spot. I didn't want to do too much so I'll try it out tomorrow and get back with you guys. Thanks!
Oh will one spot work or should I do the whole side of the groove?
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Originally posted by Phil McGrath View Post
One spot, one spline or one side of the spline? two sides make a spline with the groove in the middle........just peen what you need too on both sides evenly, if you need too tap the gas cylinder on that's fine. Notice I said tap, not beat or pound on.
Tonight I did the spline on both sides, and it was tight but not too tight. I got it started and used the lock to put it on. Wasent too hard to turn, did it by hand so I figured it wasent to hard.
Comments are welcome as I have never done this before! Thanks!
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Originally posted by Pitbulz21 View PostOk I just did one spot to make sure I wasent boogering it up and shot it today. After putting 2clips thru it it was loose again so I realized it wasent enough meat moved to fix the problem.
Tonight I did the spline on both sides, and it was tight but not too tight. I got it started and used the lock to put it on. Wasent too hard to turn, did it by hand so I figured it wasent to hard.
Comments are welcome as I have never done this before! Thanks!
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Originally posted by Phil McGrath View Post
Be careful your better off tapping it on/down too where you need it and not using the lock for running it down for final seating. Doing so if you have moved too much metal too the center you'll risk at worst pull/rolling the threads off the barrel or the possibility of pull/rolling the threads out of the lock. Once you have the fit your after leave it on and don't mess with it unless you have too.
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Originally posted by Orlando View PostUse a block of wood and hammer to drive on the gas cylinder
You should see how tight a fit a NOS gas cylinder is on a NOS Barrel.The ONLY way is to drive the cylinder on
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