I'm still waiting on plans to come out for general public use
<spring pressure effecting ejection speed
Read Hatcher's Notebook, he goes over pretty in depth over how spring pressure has little to no effect on ejection speed because the force of the burn/explosion is orders of magnitude more powerful than a spring. This is why delayed blowback became mandatory was because they had to delay the blowback long enough to save the brass from splitting.
Essentially, spring pressure ONLY effects cycle rate, not ejection speed. It governs the rate at which the bolt returns to the chamber from the rearward position. In other words, the lowest setting spring position would be the lowest fire rate, as a high tension spring would result in a higher fire rate.
Some good reading on bolt weights for straight-blowback.
https://www.orions-hammer.com/blowback/
I'm new to the thread, but I love the idea. Lever delayed blowback in 10mm (or similar). The idea of a friction adjustable lever (conical ring is good) is also great. I think the purpose of
>mix of these 2
is to have a short range spit-rifle that you have the capability to suppress longer ranges if needed. The problem with autopistols that I have is they are difficult to control, so I think the middle SMG route is good for controlability as well as a nice added benefit of a few hundred yards more range.
Frankly, the idea of a cheap producable bullpup pistol SMG gets me hard. if only we could solve the brass2face issue. The big advantage of pistol calibers is you reduce the throw of the bolt and the length of the chamber by 2+inches.
Again, though, my biggest issue about reducing an SMG to an autopistol is controlability, that's why I shill for the SMG/PDW style weapons. If you want to throw a lot of lead downrange in city or close quarters you want the leverage on the gun that a longer weapon affords.
>Slide vs bolt being the issue
True. Actually I was talking to a US Army weapons developer and he was saying that the harshest 'jump', the biggest single factor in recoil was the bolt slamming home in the chamber, that if there was a way to reduce that you'd get a much lighter recoil, though a light bolt helps substantially with that.
>carriability.
That's a good point. I was thinking of the ultimate in usability for home defense and close quarters. To carry it properly requires it to be shorter than, say, 15" collapsed?
We might be able collab on a crossover at that length, what OAL were you thinking of?
Incidentally, I wonder how hard it would be to turn .pdfrelated into a 10mm lever-delayed, it already seems primed for the adjustable spring. Just make it dual-stack double feed and we'd be gtg.
And yeah Hatcher's Notebook should be required reading on 8/k/, it's a great read
I guess I should ask what you're aiming for, so far rereading the thread I get general requirements/features as follows for a /k/ SMG and correct me if I'm wrong
<delayed-lever-delayed-blowback
<adjustable fire rate
<select fire
<light
<ease of manufacture [Stamped?]
<barrel shroud
<rail w/buis
<10mm or similar overpowered pistol cartridge
Questions pertain to size (concealable or nah?) mostly. Could be a slightly scaled down/altered pdfrelated, too.
Barrel shroud only because in such a short weapon you want to protect the hands of the shooter but there are other ways of doing that.
>nah, but wearable
Agreed.
As for manufacture, if somebody in the thread has a mill, lathe, and press (not too much to ask) then prototyping the general idea might happen, would be cool. Not that you'd actually be able to mass produce them or anything this is just speculative.
But I like the idea of the bullpup SMG just because the added barrel does effect ballistics. Disadvantages of course include brass2face effect, shit triggers, and sometimes awkward loading.