I need help IDing a remington 700 barrel in 6mm REM. This is a heavy barrel, over all length, from the threads to muzzle is 27 1/4 of an inch. On the left side it is marked 6mm REM with a diamond mark immediately to the right of this. On the right side, it is marked R (as in registered trademark) with REP (Remington Peters?) in an oval. It is tapped for rear and front sights. It weighs about 5 pounds. I did one rotation in 14 inches with a jag, so I assume the twist rate is about that. It has a very slight taper. No recessed crowning of the muzzle. The rifling appears to be strong, the threads aren't buggered and the chamber looks to be very clean and crisp. Is this a factory take-off? Any info is appreciated. I have no use for the barrel, and am looking to trade/sell it. I handload for .303 brit, Mosins and am a blackpowder/rendezvous enthusiast.