They claim sub 0.5 MOA...I'm on the hut to see if that's true.
Another thing to remember with a lot of these .50 BMG rifles that make accuracy claims. Most all of them are shot with super match grade ammunition with custom CNC lathe turned, solid brass, match grade bullets that can cost up to $7.00 per round. With standard military grade Ball ammo the groups will open up considerably. With any and all grades of milsurp .50BMG ammo, the thing to remember is as a general rule the more the bullet does, the less accurate it will be doing it.
For example, .50 BMG Ball is the most accurate military ammo. It usually is the most expensive as well. Tracer and armor piercing are a little less accurate. Armor piercing incendiary is less accurate still. Armor piercing incendiary tracer are the least accurate. There is nothing "wrong" with any of these rounds, it's just that most are good for plinking and informal shooting. Out here in Arizona you have to really be careful during the fire season with incendiary and tracer rounds. These things can carry for miles, and they are very capable of starting brush fires. Another thing to remember with a .50 BMG is you can have 3 holes touching on the target, and still have an
1-1/2" group! Bill T.