Where does the rifling stop in a threaded barrel?

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[ARCHIVED THREAD] - Where does the rifling stop in a threaded barrel?

Posted: 9/5/2005 5:17:45 PM EDT

I have a Vector underfolder and noticed something odd, or at least new to me. The Polytech AK I have has rifling that goes all the way to the end of the barrel. So when I unscrew the slant brake, the rifling is right there at the tip.

On the Vector, approximately the last 3/4" of the barrel, ie. the threaded portion, is widened and has no rifling. The parts kits they use are supposed to be Hun or Polish. Is that a characteristic of either of those AK's? BTW, the bore looks very nice.

Posted: 9/5/2005 5:59:22 PM EDT

[#1]

Backbored?

Posted: 9/5/2005 8:08:46 PM EDT

[#2]

My 2 Romys (WASR10 & SAR1) have threads all the way to the end.

Posted: 9/5/2005 8:31:34 PM EDT

[#3]

My Vector underfolder rifling goes all the way to the end. I don't think its polish, but my classic is.

Posted: 9/5/2005 9:20:02 PM EDT

[#4]

Quoted:

On the Vector, approximately the last 3/4" of the barrel, ie. the threaded portion, is widened and has no rifling. The parts kits they use are supposed to be Hun or Polish. Is that a characteristic of either of those AK's? BTW, the bore looks very nice.

It's counterbored, there was probably a nasty spot there and it was removed .

Posted: 9/6/2005 9:02:02 AM EDT

[#5]

Quoted:
Quoted:

On the Vector, approximately the last 3/4" of the barrel, ie. the threaded portion, is widened and has no rifling. The parts kits they use are supposed to be Hun or Polish. Is that a characteristic of either of those AK's? BTW, the bore looks very nice.

It's counterbored, there was probably a nasty spot there and it was removed .

Could you explain counterboring in more detail? I'm guessing that what you mean is there was some damage to the crown and they bored it out to remove that, correct?

Posted: 9/6/2005 2:12:59 PM EDT

[#6]

BTT for more info on counterboring.

Posted: 9/6/2005 3:22:12 PM EDT

[#7]

If it was just the crown that was messed up, one could have the crown recut. But, to have the inside of the barrel messed up to require material removal, the guess is that there must have been some thing wrong inside of the barrel.

So, they took it to a lathe and machined out the rifling. Either that or they used a reamer and bored out the barrel. I do not think I have ever seen a barrel that had the rifling machined out in such a manner.

Posted: 9/6/2005 5:47:26 PM EDT

[#8]

Quoted:
If it was just the crown that was messed up, one could have the crown recut. But, to have the inside of the barrel messed up to require material removal, the guess is that there must have been some thing wrong inside of the barrel.

So, they took it to a lathe and machined out the rifling. Either that or they used a reamer and bored out the barrel. I do not think I have ever seen a barrel that had the rifling machined out in such a manner.

Thank you. I wish I could post pics but I'm not sure they would turn out. I will shoot it on Thursday.

Posted: 9/6/2005 6:42:44 PM EDT

[#9]

Counter boring is really a faily common repair in military firearms.. I would guess that the muzzel end damage is due to un-coated steel cleaning rods, and improper use of them..

Chances are the bbl was counter bored by the Country of origin, and not by Vector..

Posted: 9/6/2005 7:10:58 PM EDT

[#10]

Quoted:
Counter boring is really a faily common repair in military firearms.. I would guess that the muzzel end damage is due to un-coated steel cleaning rods, and improper use of them..

Chances are the bbl was counter bored by the Country of origin, and not by Vector..

That actually makes me feel a lot better. I had just never seen this before so I was like WTF. I'll see how she shoots on Thursday.

Thanks guys.

Posted: 9/6/2005 9:42:32 PM EDT

[#11]

I have handled hundreds of Russian AK-47 barrels, and have seen many counter boring jobs.
Many of these were done on brand new barrels; if the chroming job for example, was too thick near the muzzle. Chroming a barrel properly is indeed a difficult task, but if counter bored, at least you still have a usable barrel (minus of course the .5" to 1.5" of missing rifling).

-C

Posted: 9/7/2005 1:51:03 PM EDT

[#12]

Quoted:
I have handled hundreds of Russian AK-47 barrels, and have seen many counter boring jobs.
Many of these were done on brand new barrels; if the chroming job for example, was too thick near the muzzle. Chroming a barrel properly is indeed a difficult task, but if counter bored, at least you still have a usable barrel (minus of course the .5" to 1.5" of missing rifling).

-C

Thanks for the info. I had never heard of this process before this thread. I've only read that if a crown was damaged then the tip could be cut and re-crowned.

[ARCHIVED THREAD] - Where does the rifling stop in a threaded barrel?

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