AR-15 Barrel Extesion question?

ultramagmed

ultramagmed

JKM
AR-15 Barrel Extension question?

Now to my other dilemma,

I recently bought an AR-15, I took it apart to get some dimensions for an upcoming rebarrel project. I built some bushings for my action wrench to remove the barrel extension. It turns out that wasn't one of my better ideas since I managed to crack the barrel extension in the process. I am certain the pin will not line up with my upper receiver after replacing the extension. My question is; if I order a new barrel extension can I drill it to to get everything to index properly? I know they are hardened, can they be drilled? The barrel is chrome lined and I wouldn't think I could bump the shoulder forward and re head space to get everything lined back up, or can I? Are there any other options to consider in this situation? This is quite a pickle I've gotten my self into, so any and all suggestions would be appreciated.

Thanks in advance,
Med.
 
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Nope. The feed ramps won't line up and timing will be off with the bolt if the pin isn't lined up.--Mike Ezell
 
buy one, put it on check position......see if you can shim it out and still be in spec,,,,

and yes they are hard..probably why you were able to crack it..
they make wrenches that fit the extention..bbl vise on the bbl...

mike in co
 
I did order an upper receiver action block, along with a barrel extension tool and a new barrel extension. I now just need to find out what I can do to get everything indexed back into place. I am also not 100% sure that the barrel is chrome lined, is there normally anything stamped on the barrel to to designate chrome lined barrels? I'm not opposed to lengthening the barrel tenon and re-head spacing in order to salvage the barrel. I am just not sure if a chrome lined barrel can be re-chambered if in fact that is the case. Any other ideas?
Med.
 
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This likely won't help but I will throw it out there anyway.

I had an issue with a barrel extension on a custom that I was building for myself. I was trying to smooth the feed ramps and got a little carried away.:eek: I didn't have a lathe at the time, so I ordered several barrel extensions and tried them. One luckily was only about 30 degrees off from the original. I put it on and bent the gas tube around the barrel and lined it back up.

This was on a free float barrel with a longer float tube and it covered almost all the gas block to it wasn't noticable unless you looked for it. I know it wasn't right, but I wanted to try it out before I invested anymore money into the idea.

If you are using the front sight/gas block on yours, of course this is out of the question.

Jim
 
Best bet is to just buy a barrel blank and make yourself a new barrel. The quality of most of the OEM barrels is only fair to poor anyway. I did run into a 'blown' AR once where the barrel was still in good shape, but the bolt and extension both cracked. Shooting 'someone else's' handloads. Luckily I had about 20 new barrel extensions on hand and I was able to check out a bunch of them until one timed up properly and put the rifle back together. Chances are you won't be able to do so with just buying one barrel extension though.
 
Thanks Guys,

I don't exactly like what I hear but, I was afraid I goofed pretty good on this one. I do however appreciate the input. On the other hand, I do have a barrel here in the shop, it's a 1:14 twist though, the one that came off was 1:9, but I'm not opposed to to shooting lighter bullets. I'll wait and see what the new barrel extension looks like and make a decision from there..........who knows maybe I'll get lucky (yeah right, who am I trying to Sh$t). I am kind of a tight a$$ and certainly not wealthy so I hate to put more in to it than it's worth for what I use it for but, at least I have a couple ways to go thanks to your replies.

Thanks again for all the opinions,
Med.
 
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