Your right about it screwing right on, but it's not 1/2x20 threads. I have 3 China pups. A P-15, Bull shark & a Pinty. The 1/2 x 20 mod will screw on loosely & tighten up, but it's not a guarantee it will not clip your pellets. I have tried weihrauch mods on all 3 of my pups barrels & they...