I have them all apart doing different things to them and found something.
The Match had two locking lugs from memory. I found two in the Hunter, two in the Limited Pro but three in the Limited. My guess is this would add some extra strength to it coupled with the full length dust cover and cone-loc barrel making it the toughest!
Hunter
(https://sphotos-a-atl.xx.fbcdn.net/hphotos-prn2/1240533_577792822258754_1704690230_n.jpg)
Limited Pro
(https://sphotos-b-atl.xx.fbcdn.net/hphotos-ash4/1146718_577804028924300_1099580409_n.jpg)
Limited
(https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-prn2/1173907_577803905590979_1009118011_n.jpg)