I have a Tromix 8" barrel on my build. Running 500gr Outlaw state bullets at 1000 fps using Lil'gun.
Bullets aren't cheap but they hit hard and expand at sub velocity.
Don't skimp on ring or scopes, I have a vortex viper on this one.
Oak Point, TX 75068
$20 firearm transfers ($15 with CHL/LTC)
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