CapnMac
Member
Well, you are doing two things that do not always find favor in the gun purchasing (very much versus the gun imagining) community.I'm not sure why there aren't any roller-delayed pistols
First sin is in adding required width to the slide (and typically the frame beneath).
Second sin is in increased the number of required parts.
Sliding ramp "browning style" lock up just requires a pin to hold the barrel.
Roller delay needs at least one roller, the moving wedge to engage/disengage the roller(s), typically a spring for either the roller or the locking wedge, and retaining pins for all the parts. And the pin that holds it all in the pistol, too.
Doesn't mean it doesn't work, only that you are adding parts. Oh, and disassembly can be a bear--it certainly was for my CZ-52. Which was nearly twice as wide as my SIG 365X
Now, in some fairness, flapper-delayed blowback pistols probably ought be more common. Mind, we gun owners are an obstinate bunch and will buy more locked breech firearms than unlocked, given the ability to do so. So, delayed blowback is not really a deadend, so much as a cul-de-sac.
Slide width is also what typically dooms double-feed designs--you need a bolt face (r some portion thereof) as wide as the centers of the rounds in the magazines. Feed ramp geometry is more than passing critical, too.