I do not see any adjustment in the strap, and it looks like the strap is affixed so that it cannot be taken off. Other than that, it looks cool. If the dimensions were right, I would get it and make the strap adjustable. Maybe by adding a wider piece of leather with slots to tie a half hitch with the existing straps. I know I've seen it but I cannot find a pic of it. I think Matt Newsome was using that strap system.

T