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Posted: 4/5/2006 9:55:31 PM EDT
[Last Edit: 4/5/2006 9:56:24 PM EDT by lookitscalvin]
I'm sorry if this is a dumb question but, I've been offered a upper receiver and I've been trying to figure out if it was a chrome lined or chrome-moly barrel. I've been doing some research on the web and a few people told me to just get a bright flashlight, flash it down the barrel and if its a chromed lined barrel it will be shiney but if its chrome-moly it won't be. What confuses me is, isn't chrome-moly and chrome lined both chrome? So they will both be shiney?
Link Posted: 4/5/2006 10:21:33 PM EDT
It's usually both. Chrome-moly barrels are usually, but not always, chrome-lined. Look for bright finish in the chamber and muzzle area. USGI barrels are chrome-moly steel barrels with chrome lining.

Chrome-moly steel is the material the barrel is cut from. Chrome-lining is exactly what is sounds like, chrome applied to the inside surface of the bore and chamber.
Link Posted: 4/5/2006 10:38:00 PM EDT
Thanks for the reply, it's a rra upper that my friend is willing to sell to me for cheap, when he bought it from said it was chrome lined barrel but just trying to figure out how to know for sure. So just look at the finish and muzzle area for something bright? Thanks, appreciate the replys.
Link Posted: 4/5/2006 11:02:42 PM EDT
There are markings on the barrel over the chamber on RRA's.

First: N or W...N for NATO chamber or W for Wylde
Second: 8 or 9...8 for 1:8 twist and 9 for 1:9 twist.
Third: A, S, or C...A for moly (chrome -moly Alloy), S for Stainless, and C for Chrome-lined alloy.
Link Posted: 4/5/2006 11:34:38 PM EDT
Okay I'll check it out. Thanks a lot for your help.
Link Posted: 4/6/2006 12:41:03 AM EDT
I checked, there isn't anything like that. The only thing I see are the numbers "212"
Link Posted: 4/6/2006 1:05:38 AM EDT
Nm found it, it is chrome lined. They changed the serial I guess on the newer RRA barrels.
Link Posted: 4/6/2006 2:47:01 AM EDT
Stick a white Q-Tip down the muzzle and shine a light. If it's a polished mirror surface (on a used barrel) or a light gray surface (on a new barrel) it is a chrome lined bore. If it is a dark colored surface, it's not chrome lined.

Not all chrome lined bores will have a chrome ring at the muzzle.
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