So Im dumb... *Pics Added*

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DerrickLee

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so I have an issue . got my m14 havent fired it yet and I started takin it apart to clean the grease and everything up. Here comes the problem I got ahead of myself and didnt read the directions fully and must not have been paying attention. Anyways long story short I put the gas piston into the chamber without paying attention to the alignment the flat part. I started screwing in the plug and it pushed the piston against the edge of the whole and unless there is supposed to be a small piece of metal sticking up I managed to create a burr. The piston still slides pretty freely in there except for the last few millimetres when pushing the oprod back. any suggestions? is this gonna affect the safety of the gun? is will it cause my gun to short stroke? should I file it down or take some emery cloth to it? should I send it to a gunsmith? should I replace the chamber? anybody screw up like this before?
 
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The piston still slides pretty freely in there except for the last few millimetres when pushing the oprod back. any suggestions?
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The small piston should float freely. If you lock the op rod back (with an empty magazine, for example) does the piston stick anywhere along its travel?


is this gonna affect the safety of the gun? is will it cause my gun to short stroke?
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Shouldn't have any effect on safety or how the bolt locks up as long as the op rod goes all the way fwd.

Short stroke? unlikely especially if you solve the problem.


should I file it down or take some emery cloth to it? should I send it to a gunsmith?
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A stone might be a better idea if you can find the "burr" that you mentioned. On this point is the "burr" on the piston, or in the chamber that the piston slides into? Gunsmith? your call, at least until you post pics.


should I replace the chamber?
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Most likely this is repairable. How much force did you use to screw the plug down with the piston misaligned?


anybody screw up like this before?
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If it can be screwed up, it will have been done before.
 
ipscgraz the burr is in the chamber that the piston slides into. The piston seems to float freely but when it has slid back as far as it will go I can still pull it back further a couple thou. my camera is broken so Im gonna be borrowing one from someone later tonight hopefully so I can get some pictures up either tonight or tomorrow. if I cant get some good pictures I might just end up sending u the whole top end to you Hungry.
 
How does it feel when you pull the piston back the last few thou? Is there a scrape effect? The gas cylinder(which you were referring to) isn't soft fragile metal, it is heat treated, hardened. I doubt you severely damaged anything.

Give your gas assembly a good clean and ensure it is dry(no grease/lube) as the gas system is supposed to run dry. Examine with a bore light/flashlight where the piston might be scraping/binding to before doing anything with sanding or sending across the country.

I'm willing to bet nothing serious here and that one box of 7.62 NATO at normal rate of fire and your M14 will be singing sweet songs.
 
If you want to locate exactly where the burr is making contact, cover the surface of the piston with a felt pen. Run it back & forth a couple of times and you will see exactly where the contact point is, where it has scraped the ink off. A little Hoppe's will take the ink off after.

I can't see a problem with some 600 grit to polish down the burr. Find a file or something with a radius as close as you can to the bore or flat in the cylinder; use that under the 600 grit.

Two strokes at a time.
 
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Any damage to the piston?

I would simply take the high point off with a jewlers file and be done with it.
 
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That bur is pretty typical in Chinese M14 and also by beginners. a small file will clean it up, blow the filing out of the gas cylinder before you reassemble, and be a little more careful next time.
 
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