[ARCHIVED THREAD] - Barrel Identification

Posted: 8/29/2007 7:58:12 AM EDT

This is an Olympic upper but I was told by the seller that it is a bushmaster chrome lined barrel.

All I can see on the barrel is between the gas block and the flash hider, on the top side of the barrel.

It says, I believe: B MP 5.56 NATO 1/9

But, the B could be a 6 and the M could be an N

Thanks for any help.

Posted: 8/29/2007 8:02:15 AM EDT

[#1]

Ok, I revised a google search and yes, it is a bushmaster barrel. How do I tell if it is chrome lined?

Posted: 8/29/2007 9:36:59 AM EDT

[#2]

Bushmaster Barrels... are the finest AR15/M16 type barrels made - machined from Chrome-Moly Vanadium steel - Rockwell C26 to 33 hardened. And we now offer 20"/24" Heavy Barrels in Stainless Steel! Most Bushmaster barrels are hard chrome lined (except the Stainless Steel barrels) to offer corrosion resistance in the bore and chamber. Chrome is more than twice as hard as barrel steel and effectively doubles barrel life with proper care (exactly why the military specifies the process). Chrome’s lubricity (i.e. “slipperiness”) reduces friction, increases velocity, aids in chambering, extraction, and speeds barrel cleaning. Bushmaster barrels are manganese phosphate finished (again except the Stainless) to guard against exterior rust or corrosion, and to provide the matte black, non reflective finish found on quality military arms.

www.bushmaster.com/shopping/barrel-assemblies/