The GM-M46 is a 16.5" long, 7.62x39 mm caliber AR15 barrel with a button rifled, stress relieved .301” bore and .311” 4 - groove diameter and 1:8” twist.
Features include a carbine length, .750” diameter gas system, a Nitride finish inside and out on 41V50 steel, assembled extension with M4 feed ramps and 5/8-24 muzzle threads. 1.7 lbs. WHILE SUPPLIES LAST
Posted by Unknown on 20th May 2016
Zdorovo is Russian for awesome, at least that's what Google said. I really enjoy my 762x39 AR15 build, especially with this barrel. For and finish is superb, always expect a good product from GM - especially for the price.
The 1:8 twist makes the x39 round more stable mid way through its supersonic flight, well into transonic. You can see signs of minor over stabilization at close range (I was sparking steel at 50m). Nice groups at 2-300m and hits on steel at 400. I'm professional marksman by trade so I can appreciate what a faster twist rate can do for a shooter. so far I've only shot Golden Tiger out of the barrel. I don't have any complains. I can do close quarters shooting drills as well as ring steel at mid range distances with this barrel. Thanks GM for making it!