22 lr barrel rifling

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fedor7

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Hi,
Has anyone had a 22 lr barrel where the rifling in front of the muzzle have separated from the barrel? This is a one-piece stainless barrel. No sleeve. Should note this barrel had 2267 rounds of CCI 22 shorts 27 gr. HP. over 2 years shooting.

May 3,2022 - Just an update. Machined off 2 inches of chamber end and machined new chamber and fitted barrel to receiver. Shoots not quite as good as before 1/4" at 50 yds. groups -- now 5/16 " at 50 yds. Best of all this barrel is back in service. So far, this year have put 1550 rounds of CCI 22 short 27 gr. HP and rifling still looking good.
 
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fedor7 said:
Hi,
Has anyone had a 22 lr barrel where the rifling in front of the muzzle have separated from the barrel?
Click to expand...

I can't see how that's really possible under any circumstances I can imagine...

BUT I have seen something that looks very similar to that before- is it possible that lead fouling sticking to the lands of the rifling has built up to the point where it's protruding from the muzzle? I've seen a few .22's where it looks like the rifling it starting to push out of the muzzle, but in reality it's lead fouling sticking out in line with the lands.
 
If you're commenting about an AR 7 survival rifle, yes.

I've seen a couple of AR 7 barrels separate from the liners.

Not sure why. Maybe poor adhesion of the aluminum??

If your rifle's barrel has been sleeved and whoever did the work didn't get enough epoxy to fill the void right to the muzzle, it can appear to be separating. Likely just fine.
 
bearhunter said:
If you're commenting about an AR 7 survival rifle, yes.

I've seen a couple of AR 7 barrels separate from the liners.

Not sure why. Maybe poor adhesion of the aluminum??

If your rifle's barrel has been sleeved and whoever did the work didn't get enough epoxy to fill the void right to the muzzle, it can appear to be separating. Likely just fine.
Click to expand...

Ah, hadn't thought of liners- that's entirely possible.

More details or photos would help here OP
 
SomebodyTookMyName said:
I can't see how that's really possible under any circumstances I can imagine...

BUT I have seen something that looks very similar to that before- is it possible that lead fouling sticking to the lands of the rifling has built up to the point where it's protruding from the muzzle? I've seen a few .22's where it looks like the rifling it starting to push out of the muzzle, but in reality it's lead fouling sticking out in line with the lands.
Click to expand...

I'm thinking this is what you are seeing.

If some rifles are shooting steel jackets at more then twice the speed of a 22 rimfire then this mild round is not tearing the lands from the barrel....
 
bearhunter said:
If you're commenting about an AR 7 survival rifle, yes.
I've seen a couple of AR 7 barrels separate from the liners.
Not sure why. Maybe poor adhesion of the aluminum??
Click to expand...
Isn't the stock AR7 barrel a steel sleeve in ABS (just checked with a magnet: it is)? It could separate (would be QUITE a beating though; my AR7 has seen some 500 rounds without any noticeable ill effects other than chamber needing a bit of swaging from too much dry fire inevitable where there's no lock open bolt), but it wouldn't look anything like "rifling separation"?

+1 for excessive lead fouling in the lands looking like "rifling separation". Pics please!
 
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