United states of brazilian nations wrote:1- would the recoil from that be at least acceptable or will it be a LOLshoulderbreaking recoil? i'm thinking the second option, but i've never fired a gun (gotta be a law-abiding citizen always) so i dunno.
recoil wouldn't be the worst, but follow shots would be a bit hampered vs. a better PDW cartridge, and muzzle blast will be terribad if you put on a compensator on it
2- could i get decent muzzle velocity from, say, a barrel roughly the same length (maybe a little shorter) than a CTAR 21 or a little longer than the one of the P-90 (think a middle ground between both)?
It looks like .308 from 12.5 FALs are getting velocities similar to a 7.62x39, but using heavier bullets, so you should be good there.
3- could i get at least some accuracy from the same barrel? i mean, this will be issued to tank crews and such as a PDW, so i believe around 100-250 meters?
Barrel length has a negligible effect on accuracy.
4- would it offer any significant advantage over other PDWs?
rule of cool from pretty muzzle flash? You'd have heavier bullets than 7.62x39 with similar velocities, but they *do* make 154 grain x39 ammo.
5- would i be better off with some sort of PDR chambered for .300 AAC Blackout?
yeah, or 7.62x39 - it's pretty much made for SBRs
What is your general issue rifle/carbine? It sounds like you're just wanting a subcarbine anyways, so you may as well just make a subcarbine based on your general issue rifle, and that way training, logistics, and costs are simplified and mitigated.