I have been using a Gen 1 22Mag on a 22 inch duplex hunter for several years. I like how low it rides when in heavy brush. It's been a great setup for me. I think the Stryker XL would be awesome on this frame. It may be a overkill if you don't intend to haul meat. In the end, if the...
The stay pockets were for the old Bikini frames. They won't be an issue with a Duplex Light frame. I will say, however, the forward pull system on the new belts is superior to the system on the older belt you have pictured.