I think one of the things that originally had me hesitating the G4 purchase, which I failed to mention in the review, is the way Glock did the back straps. They do seem kind of cheap, and certainly like an "afterthought", which they definitely were, when you compare them to the M&P line of pistols, that were actually built around interchangeable back straps. With that said, I think Glock did a great job, of adding interchangeable back straps, to a pistol not originally designed for them.