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Posted: 3/4/2006 1:07:22 PM EDT
Is there any way to tell if a barrel is worn out? I bought a barrel a while ago that was said to be shot out. I robbed about every usable part for other builds.
Today I was looking at it and decided to clean and inspect it. The 7.62 cleaner turned all shades of blue.
It doesn't show any noticeable signs of wear. The rifling looks good and sharp.
If I assemble this to a upper and the go and no go gauges are ok than shooting it is safe? On a target the bad rifling will show up?
Sorry for the newbie questions I just don't want to toss out a good barrel or worse loose a finger or hand.
Thanks Ed
Link Posted: 3/4/2006 10:35:33 PM EDT
What gets worn out on a barrel is the throat area, and not the rifling....that is the area just ahead of the chamber as it turns into rifling. In a non-chrome lined barrel, every 1000 rounds wears the throat about .001...so 5000 rounds erodes .005....etc. (This is a general concept, and mileage will vary.) As the throat erodes, accuracy will deteriorate.

Throat erosion is hard to see with the naked eye...I can't at least, but it is very easy to measure... but only with the proper tools. So basically, what we end up with is that shooting it is the only really practical way to determine if the barrel will give you the accuracy that you desire. It all depends on what level of accuracy you want/need. If you think it shoots okay for what you want to do with it...then it does...end of story.

Also, I have also seen a lot of barrels that were said by their owners to be "shot out". After a good cleaning with the proper copper solvent they looked like new again! With the copper fouling gone...they shot just like a new barrel too...so you may be on the right track here.

Let us know how it turns out.

TC


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