I don't like the drop leg rig
I used a Drop leg rig for these matches for quite some time. I found that all the running around with my pistola flopping around at my thigh was a huge PITA and not exactly comfortable for all day wear.
Crawlling prone would get my pistol dusty, dirty and in some cases bang up my rear sight.
These matches require a lot of movement.
I find having my pistol nice and snug on my hip a much better way to carry.