I RO'ed a guy (in Steel Challenge) yesterday who was running a Glock with what looked like a very large spring clip mounted on the right side of the slide serving as holster retention. Is this a thing? After his first draw I changed position since he was having a bit of difficulty getting the gun out clean; not scary enough to DQ, but definitely wanted to be well clear of the muzzle. Of course I've never RO'ed someone with a machete in a belt-mounted scabbard; don't recall this being prohibit gear so fire away. He was a reasonable hand with iron sights. We got hit with rain and hail, match called, so no opportunity to explore this setup variant.