I simply 100% disagree with the assertion that civilian home defense had a thing to do with the P90's design parameters.
Oh, of course it wasn't designed for civvies; my point is the military design parameters align almost perfect with domestic defense needs --kinda like that SBR 223 of yours in that respect. A happy coincidence
However, as a semi-auto weapon for civilians, that low recoil facilitating better accuracy with a very high ROF is kinda useless, as the far more powerful 5.56x45 is more than controllable by even very small statured shooters in an AR weighing no more than the PS90 (6.3 lbs) and barely longer.
By ROF I'm not referring to its cyclic rate, but to the speed at which a shooter can easily reacquire a target and deliver a subsequent shot; it's very rapid with the PS90. It's also rapid with 223 compared to battle rifle cartridges, because neither is enormously powerful objectively, but still jumps around more than 5.7 (especially in a lightweight SBR format). Is the additional power really worth it at close-contact distances? In my estimation, no, since a COM shot with 5.7 or 223 will both be grave, but your calculus may be different. If that SBRd AR is also suppressed (looks like a can, there) then I agree it's a very formidable & capable platform for defense; but a two-stamp gun simply isn't in the offing for everyone.
It's also funny that you'd bring up the 'armor piercing' portion of the NATO requirements, considering 223 far exceeds them by virtue of its 3X higher ballistic energy --just something I've noticed in many 5.7 threads from folks; it gets tossed out as some 'ridiculous' feature with no applicability to civilians, who then turn around and advocate for a bullet that will do the exact same thing and then some without the need for fancy ammo
. Me, I don't really care about the AP feature; I love that it shoots like a rifle but kicks like a pistol carbine.
I just hate the fanboyism and hyperbole surrounding it and the foremost firearms in which it is chambered.
I'm a huge fan, but not a fan boy; I agree there are a lot of people with wildly unrealistic expectations out there, namely those who think 5.56 is even a competitor rather than service-pistol rounds. It's lower-end 9mm effectiveness. Which is also exactly good enough (but not much more than that) as a hundred years' experience has shown. The 5.7 is able to approximate that performance while exceeding both weight, capacity, and range limits of its nearest competitors. My logic is a domestic defensive role means range is of the very short variety, which means there is no need for a cartridge powerful enough to deliver decisive blows through light cover hundreds of yards away; this suggests something in the pistol-power range of cartridge. The PS90 is probably the best PCC available by the numbers*, hence my endorsement of it.
TCB
*By the numbers means not factoring in personal preference (although it's much lighter than an MP5, and softer shooting than a 9mm AR)
PS- would love to hear more about that 5.7 bolt gun. I've long suspected the blowback nature of its platform is a severe limiting factor to the cartridge's potential. Its small, brief pressure impulse suggests that stuffing a heavy-for-caliber VLD bullet in there would yield a very quiet subsonic round (miniature Blackout, in other words) that is still centerfire