I just got my shoulder rig today, but I'll be sending it back. It supposedly is capable of handling my G21, but after unloading my weapon and trying to adjust this rig, it just didn't work for me. The gun didn't seat well, and the retention spring strap was, in my opinion, anything but Quick. I don't think they sent the correct one, or, they had the wrong picture on the page, because I thought the one I chose had a better covered trigger guard. Oh well, I'll try some options at the Puyallup Gun Show, and hopefully I can get something closer to what I have pictured in my mind. But I do like the hat they sent along with the order, and I'm hoping I can keep it!