Well, he does say "almost" all the parts are interchangeable.
I'd like to know the following;
-What distance did he do his range testing at to get "90% bulls eyes"?
-What weight of BB was he using?
-What size was the target?
I don't care how old he is, but he should have done some research on what review details should be included. Maybe he'll do some add on's to this review and clean it up into a decent, complete review.