Like the title says, any opinions on this matter? Id like to stay around the mid 130's at the muzzle and hearing safe at the ear. My goal would be to keep the shortest OAL possible. Being able to shoot standard as well as sub sonic ammo would be a plus, so atm im shying away from 9mm cans. Im currently leaning toward an Ops in 3rd, which would add 7.25, but I want more suggestions.