A one-inch grouping at 100 yards (91.44 meters) is just shy of 0.016 degrees (tan^-1(1/3,600)), which is also a tiny bit less than 1 MOA (1/60th of a degree). As such, at 125 meters and 0.18 degrees of minimum spread, you'll have a grouping of about 15.46 inches or just under 0.393 meters. Of course, that's not entirely true since you'd have to also factor in recoil. I also don't know the character dimensions. Another factor is shooting stance. A target that crouches or prones will obviously be more difficult to hit, but at the same time, if they are hit, it'll more likely be an extremity. One last thing to note is that wielding your sidearm puts you into a one-hand stance that positions your side towards the enemy, and thus decreases your profile. Of course, successfully defeating a Huot user with a handgun at 125 meters is quite a crapshoot.