I should note, that the angle may not be exactly 45*, that is a description from memory of pictures helping a guy on this site trouble shoot his. It is something close to that angle. Absurdly steep. They are selling what is clearly a product which made it into the first or second mock-up stage of protyping, and they said "good enough".
Part of why I consider them to be a shady business. They are willing to sell a product they know isn't developed enough to work well.
-- Not unlike the promag 10/22 drum I bought years back which required a shell to hit nose in to a sharp flash line on a zinc cast feed ramp, then suddenly jump ~.3" upward over about the same distance of travel. It would cut the lead, and bend each shell into a macaroni noodle if you tried it in the gun. It couldn't work. It didn't need polish, it needed more design. They were selling those knowing they couldn't work for any customers at $75 each while they released a new design, which did work. No recourse for the early adopters or those like me who were dumb enough to pre-order.
I know you had your own frustrations with preorder, and your customers were a bit frustrated too. But no one could accuse you of being satisfied with releasing an under performing product, or leaving a customer with defective kit. I know of several people who screwed up their own drums though ignorance and rasps that you sorted out on your own cost. I'd buy from you. I would not buy from promag or black aces.
PS. Please put your patent to use on the DS mags, or maybe do a collaboration with CSSpecs. They are a stand up company.