Ice Breaker. It's called LDR 5001 and I bought it from the vanguard quartermaster. Once upgraded, it has the same exact impact as Ice Breaker, which does some major damage. I'm happy with this find because it's Arc and allows me to use my Hawkmoon. It has a bit less range, and a smaller mag, but has much better stability than Ice Breaker. Anyone looking for a high impact sniper that can get to 331 attack, this is your gun.