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Bulged barrel in new CZ527 carbine 7.62x39
onepopper
Member Posts: 1,825 ✭✭✭✭✭
Bought a new unfired CZ527 carbine, ser # A552x and while cleaning the bore prior to firing it the first time, I discovered a bulge in the barrel 14" from the muzzle and about 3/4" long. Can't tell how overbore the bulge is but you sure can tell it with a patch and jag. This position is right at the rear sight boss. Returned it to CZ-Kansas City and they sent ser # B824x as a replacement. You guessed it, the replacement has a bulge at the same location. I am presently awaiting an answer to my letter to the factory in the Czech Republic. CZ-Kansas City has also sent a letter to the factory. If you have one of these carbines, I would highly recommend that you run a tight patch through the bore from the muzzle and feel for the bulge. If you run a patch through from the breech I don't think you can sense the bulge. Sincerely, single popper[:(][:(][:(]
onepopper
onepopper
Comments
Rafter-S
Mark T. Christian
"...hit your enemy in the belly, and kick him when he is down, and boil his prisoners in oil- if you take any- and torture his women and children. Then people will keep clear of you..." -Admiral of the Fleet Lord Fisher, speaking at the Hague Peace Conf
onepopper
Since I can't actually handle and work with your rifle, any of what I propose is just a guess.
I don't think that what you are feeling is a bulge or a ring. I think what you are being sensitive to is the site island area of the hammer forged barrel. In order to get the site island, a ring must be left all the way around the outside of the barrel. In a separate machining step, all of the ring is removed from the O.D. of the barrel except for what is needed for the site base. Hammer forged barrels have huge amounts of stress built up within them simply from the process. When an area is machined after the forging, the steel in that area will be slightly relieved or it will relax, if that makes more sense. It gets just a tiny (and I do mean tiny) bit bigger in the bore/groove area. It is so tiny that you can't see it with your bore light but quite possibly can feel a subtle difference with a very tight patch. Another way to get a an idea of where and what it is would be to air gage the barrel. That's probably out of the question though since very few barrel makers air gage any more and the equipment is far too expensive for a gunsmith to purchase for the rare use it would get.
Just another way to look at the question.
Best of luck!
I'm not trying to be a wise guy, but if that is the way you
feeling it, then you must be cleaning that way.I own many CZ rifles,
and have been so impressed with the out of the box accuracy.
Teach them young ! Teach them often !
God bless America!
Why are you cleaning from the muzzle end in the first place.
I'm not trying to be a wise guy, but if that is the way you
feeling it, then you must be cleaning that way.I own many CZ rifles,
and have been so impressed with the out of the box accuracy.
Teach them young ! Teach them often !
God bless America!
Typically running a cleaning rod in from the muzzle is the only way to get one down the barrel. Kinda hard to do it from the breach unless you remove the barrel from the reciever. Unless it's a bolt action and you remove the bolt.
Teach them young ! Teach them often !
God bless America!
JM
bgjohn, I know how to remove the bolt. Sincerely, one popper
onepopper