Quoted: Bushmaster, because you get chromed lined and the barrel is 4150 steel, instead of the 4140 that RRA uses.
That said, RRA is still a good rifle.
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You can get chrome lined RRA barrels, it is like a $30 option.
However my biggest complaint is that you can get any contour RRA wilson barrel you want, so long as it is a heavy-barrel profile. Their "R4" profile simply has a cut for the 203 nade launcher, but retains the Heavy-profile under the handguards.
The whole point behind a Patrolman's Carbine is to have a lightweight duty carbine to carry around all day. The 16" M4 profile barrel is neat because you have the flexibility of swapping FS's w/o cutting the soldered/pinned flash suppressor from a non-SBR'd 14.5" M4 barrel.
I wouldn't be able to see the difference between 4150 and 4140 steel. The most important aspect would have to be the profile of the barrel you want. Everything else is essentially equal.