Top definition
An AR platform rifle in the .308 caliber. Far more powerful than the standard .223 round, the .308 is suitable for taking large game at far distances. If an AK47 is a chopper, a .308 M.B.R. is a fucking disintegrator.
Billy: Holy dog shit, that AR-10 just chopped that dude with the bullet proof vest in half!
Timmy: I know, I can't wait to get a .308 mbr so I can fuck shit up too!
by The coyote July 22, 2013
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