Noveske Rifleworks recently made the decision to expand their N4 barrel lineup to include the increasingly popular 12.5" length. A few years back we were talking to John and he made the comment that if he could only have one barrel length in an AR15/ M4, it would be a 12.5". He explained that the drop in velocity from the standard 14.5" barrel wasn't that much, but that the portability and overall handling of the weapon was substantially increased, all while retaining reliability.
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Note the 12.5" GPR shown in the images is wearing the AAC 18 tooth flash suppressor. The Noveske 12.5" GPR comes with the 51 tooth AAC rapid attachment muzzle device for use with their cans, but since the can I use most often is the AAC SCAR Light suppressor, mine is a bit different. I've got no doubt you could swap your muzzle device for the can of your choice. You probably noticed this model comes with the Noveske Switchblock, which does a nice job of eliminating blow back when using a can.
Below are the specs from Noveske Rifleworks. This is available as an upper, or complete weapon, and is offered in multiple configurations to include stock handguards or the Vltor VIS.
12.5" Cold Hammer Forged 5.56mm Barrel
--Made of Mil Spec M249 Machine Gun barrel steel, with heavy M249 Chrome Lining,
(appx. 2 times as thick as an M4 or M16)
--Extended Feed Ramps
--MP HP tested with certification
--1 in 7" twist
--Mil Spec Phosphate finish
--Carbine length gas system
--1/2x28 threads
--Switchblock,(US pat #7,856,917), pinned to barrel
--Forged Vltor MUR upper receiver featuring an anti-rotation interface with the handguard
--9.5" free floated handguard w/ 1913 rails
--Shot peened and MP tested bolt
--Auto carrier with properly staked carrier key
--Gun Fighter Charging Handle
--AAC 51T Blackout Flash Suppressor
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