450 Bushmaster Barrel

not that i could find. very little down south as well. and forget about putting one on a 180 clone, as all those proprietary gas blocks are .75" ID and most bushman barrels are bigger than that.
 
18.6" big bores have always been vaporware up here.
I'd try calling ATRS, they made AR barrels in the past. Wouldn't hurt to call RDSC to see if they can get one in for you.
 
Herron arms has done 450 conversion for me.

If you are looking for something pre made to install yourself, maybe get a 20" out of the us as they seem more common and cut it down
 
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