Shooting Targets USA
3/8-inch AR500 gong quoted at 477 to 534 Brinell, offered in 4 to 16 inch diameters with 1/2-inch mounting holes and published minimum-distance guidance of 10 yards for handguns and 100 yards for rifles.
Shooting Targets USA sandblasts mill scale off the plate before cutting, then ships the gong with 1/2-inch mounting holes that fit its own hangers and most third-party C-hooks. The product listing is unusually specific: 477 to 534 Brinell hardness, a named caliber list that runs from .22 LR through .500 S&W on the pistol side and .223, 7.62, .243, .260, and .30-06 on the rifle side, and explicit distance guidance. That guidance is the part to read twice. The company asks for 10 yards minimum with handguns, 100 yards minimum with rifles, and 200 yards for anything leaving the muzzle above 3,000 fps.
Add the AR500 Gong Target 3/8in to your build and see how it enhances your platform.