Originally Posted by
militarymoron
i actually brought up shims/washers to eric when the test was done. first, i asked why not make the vltor gas block a bit longer so it butts up against the step, and eric said that (as kevin had done) some barrel manufacturers are making barrels with the step moved forward so there's no gap, so the gas block is automatically centered above the gas port and also prevents movement of the gas block rearward if struck. if he made the vltor block longer, it wouldn't be compatible with those, so a shim is the correct solution. if they hear that it's needed with theirs, they'll look into it. i just think it should be supplied anyways so the gas block hole is centered on the port automatically.