Even the ones without the the muzzle brake are threaded. They came out with a new gen rpr. The second gen rpr's have the muzzle brake (along with a different handguard and some other different stuff, I believe an aluminum bolt shroud). Threaded barrels dont matter on rifles, just pistols (correct me if I'm wrong). As far as I'm aware, the only reason you see the pinned muzzle attachments on ARs, and the like, is to meet the barrel length requirement.
If you feel like driving, there's (was this morning) a 6.5 with the muzzle brake in Sacramento at a dealer that plays very nicely with gunbroker listings (they dropped 300 dollars when shown a gunbroker ad)
If you feel like driving, there's (was this morning) a 6.5 with the muzzle brake in Sacramento at a dealer that plays very nicely with gunbroker listings (they dropped 300 dollars when shown a gunbroker ad)

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