A while ago I posted a design for a linear comp/muzzle device for Scorpions with pistol-length HBI hand guards.
muzzle_device_zpsgyy1zg2a by
William Conway, on Flickr
This muzzle device overhangs the barrel so there's no gap with the HBI hand guard.
A buddy of mine has a home machine shop, and he put this together for me!
muzzle_mod1_zpsoy57wbpz by
William Conway, on Flickr
It still needs to be tapped - I had to order a 1/2x28 tap off the internet for the attachment threads, but I'm pretty excited to see how it turns out.
The plan is to test it for fit and then test fire it for function, then send it out for Mil-Spec hard anodizing...if I like the design. But I'm already thinking that it'll be a little long for what I'm going for, so I've started on Revision 2. I'll keep you posted .