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Posted: 5/14/2004 8:56:19 AM EST
I just bought my first AR - a Bushmaster M4 variation and was wondering what the correct barrel break-in procedure would be for long term accuracy. Thanks!
Link Posted: 5/14/2004 8:58:23 AM EST
I could be wrong, but I dont think a chrome-lined barrel requires a break in. Some one correct me.
Link Posted: 5/14/2004 9:17:10 AM EST
[Last Edit: 5/14/2004 9:18:40 AM EST by 123whisper]

Originally Posted By POOR_MAN:
I could be wrong, but I dont think a chrome-lined barrel requires a break in. Some one correct me.



Some say no, but I say it is just like breaking in an engine. Run it for a while to let the parts mate together, and then change the oil. Put a couple hundred rounds through it and then clean it. Any high spots in the barrel will have then be smoothed down.

Then again, any high spots in the barrel will have been blown out the barrel with the next shot. But after 200 rounds, aren't you ready to clean your new AR15? Come on, give it some love, its your first
Link Posted: 5/14/2004 9:39:32 AM EST

Originally Posted By POOR_MAN:
I could be wrong, but I dont think a chrome-lined barrel requires a break in. Some one correct me.



I found the following at Bushmaster web site.

After firing a couple hundred rounds, the chrome lining will "polish out" from its light, flat gray, factory-new look to a brightly reflective, polished appearance. During this break-in period, excessive cleaning with solvent or brush should be avoided as that will only prolong the time (and number of rounds) it takes to achieve the final "bullet polishing" of the barrel.
Link Posted: 5/14/2004 10:02:33 AM EST
[Last Edit: 5/14/2004 10:02:55 AM EST by dmk0210]

During this break-in period, excessive cleaning with solvent or brush should be avoided as that will only prolong the time (and number of rounds) it takes to achieve the final "bullet polishing" of the barrel.
I've always wondered if they mean don't clean the barrel at all for a couple hundred rounds or just do a quick swab to clear loose debris and call it good.
Link Posted: 5/14/2004 10:19:39 AM EST
I myself have bought one of those ropes that have the brush built in to it and use it dry just to clean the fouling out but not lube.
Link Posted: 5/14/2004 1:08:22 PM EST
Went to the Bushmaster web site and sure enough the answer was right there. I'm glad I asked or I would have taken the traditional one round and clean for ten... and so on. Thanks again for all the help.
Link Posted: 5/14/2004 3:05:31 PM EST
bump a case through it, and then clean it
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