Your not gonna like all that weight on your leg.. i have ran a leg rig for a awhile no and like it, but the secret is to minmize the load. Honestly, I've seen pics of guys wearing 6 M4 mags on their leg rig..... wholly weight and bulk swingin from you leg.
I run a SoTech Drop leg panel. small and stays put. then I added a SoTech 3 mag shingle that holds 3 M4 mags. I added a TT triple pistol mag mouch on the outside of the Shingle aataching it with PALS. with loaded mags it was heavy and stuck out to far. I had the shingle modified to only hold 2 M4 mags and one single pistol mag pouch right next to it. That hit the sweat spot. not a lot of weight and more importantly the load stays close to my leg, nothing to stick out and catch on.
I use the first mag for my Emergency reload. its right there. I drop my hand down and it falls right on top of the mag. makes for smokin fast reloads. I also have heard nothing but great things about Genes HSGear leg rigs as well and I have also heard nothing but great things about Tactical Tailors small Drop leg panel as well. So there are three choices right there to look at. There are other drop down panels,but i think they tend to be a bit on the large side and take up more space. Drop leg rigs are specialized and not for everybody, certainly not for long range patroling/Humping the boonies. but for short duration type/CQB/3 gun type work, they have a place.
just my $.02