Oh yeah. I keep forgetting. I got 2 black and one of the clear SXK Xeta barrels. I've tried one black one and one clear one. The black one works fine. No change in resistance and no change in anything else either.
However, with the clear one, the thing that I greatly feared has come upon me. It's makes no connection and doesn't fire at all. You can see the tiniest gap between the chimney and the post.
Of course this should be easily fixable by lightly taking a hair off the top of the barrel. With maybe some fine emery cloth. I haven't done it yet, but it should work.