I have ARs, GBs, and SnGs... I have the SOE Gear sheath for my ARs/GBs and I love the design. The fastex buckle is great and the retention is fabulous. IMHO it's much better than pouches with snaps that can catch and open up and velcro that can peel up easily after it gets debris in the fibers.
I have two kydex rigs (one purchased and one acquired as a package deal) for the ARs/GBs and I quite honestly could live without them. The retention isn't up to my expectations and my knives have flipped out onto the ground on a couple of occasions... The design is a little too open for me. Sure it comes out easily, but I'd rather know it's there after bushwacking or falling out of a tree... I haven't yet played around with heating up the kydex to tighten it up some.
I haven't tried one for my SnGs but I would imagine the retention would be much better since it is very light compared to an AR/GB. The clip on the SnG is VERY secure (even with the smooth surface of a stonewashed version.) You almost need two hands to get it out of your front pocket, or risk a dangerous snuggie by pulling up with one hand!
I have a Livesay designed custom kydex rig for a Sere 2K that is a great balance between retention and a quick draw. I have been thinking about sending an AR to him to work another one up for me.
out,
Cris