I love the fez! Holster I'm dubious about - it's a bloody awkward place to draw from over the top of a dropped slung AEG, which would still be moving as you bring your right hand across.
I'm probably over-thinking it, but the only time I've absolutely had to rely on my pistol was with my SVD diagonally across my chest against 2 people carrying AEG's patrol fashion, muzzle down, in a situation where we were all mega surprised to find each other there. I drew my USP from a really low slung drop-leg (which put the grip exactly where my hand drops to naturally - I have gorilla stylee long arms) and shot them both before they could raise their muzzles sufficiently to get on target.
Now you'll just have to trust me on this, I do have quick reflexes but I haven't practised quick draw skillz

not that there's anything wrong with doing so :lol: it's just that, so far, any obsessive compulsive energy I've had spare has gone on practising mag changes for various guns from various rigs...
Still, it'll do for just carrying your MK23 suppressor on. The only other practical solution would be a shoulder holster. I don't think that even an
ASG Strike Systems MP9 Thigh Multi Holster would work, because the suppressor would stick out so far that it may interfere with squatting and would definitely get grounded into whatever muck was underfoot... unless you converted it to a waist belt set up.