It’s basically a semi auto machine pistol. So if caliber, distance, and stopping power are the issue, then smgs are fine?
You brought up ONE weapon. You need to stick with that instead of trolling for generalizations. I gave a pretty accurate description of your one weapon after viewing one world class shooter operate it on a mixed range. Yes, he had a ball but he also missed a bunch due to a lot of factors. It might be extremely lethal if it were a full auto but as a semi auto with limited ammo, it's a plinker. It is too large to replace a handgun so it even fails there. You have to fill ALL of the features of the AR to be considered the equal of the AR because the AR fills ALL of the criteria that Stoner required it to fill. And nothing on the market today does a better job.
I didn’t bring it up. So a semi-auto SMG should be perfectly legal, like these...
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I can just use Colorado Firearms Regs on this one.
9mms. The problem here is, these aren't any more powerful and more cumbersome than a Handgun. And they are actually less accurate if you are rushed. I can site shoot faster and I can spot shoot faster with a handgun than I can with any of the following. They may be legal but they really aren't good choices. I put them into the plinker category.
MP-5 legal with the proper mag
UMP-45 legal with the legal mag
PM-9 Legal if you remove the capability to use the forward pistol grip and use the proper mag and remove the ability to use a silencer. The problem is, removing the forward pistol grip throws the balance completely off.
28 or more Grains of Powder per Round. These two are designed to go out and reach out. They are both designed for crew weapons where you sometimes have to dismount and fire on targets further than 40 yds away. You may have to go to 50 or more yds.
MP-7 This is class as a pistol. It's round is a 4.6 X 30 which has enough power to penetrate many types of body armor. The rounds are fast, real fast and small. While not quite in the same class as the 556 nato, it's pretty danged close for such a small package. But due to the available equipment and mags, it's considered illegal in many States, not all. What keeps this out of the mass shooters hands is the cost. It's expensive, really expensive.
P-90 Not Legal as the P-90 since the P-90 is a full auto. But the PS-90 is the same gun in a Semi Auto. But you can't remove most of the features on it because they are built into the frame. It uses a 5.7X28mm which is just below the 556 Nato Round. It's slightly larger, slight slower but still has enough punch to do the job. The problem this one has is, it contains a huge amount of ammo. It's mag is a 50 round mag. Luckily, this puppy (see the pun?) is so expensive that the mass shooters will overlook it.
PPM90M1 Not legal. Exceeds Max Ammo with it's 64 round mag, Designed for close quarters only. The smallest mag is 32 rounds and it still exceeds the 15 round max by a large margin. This thing is designed for house to house fighting, not for home defense. And it's only found in Russia in their Military and, of course, Video Games. Good luck in getting one. Oh, it's like anything else, if you really, really want one and have enough money you can get one. But remember, it's a full auto, limited export item from Russia.
So I found only two of your guns that could do the job of the AR if there are no local laws against having them. But you had better have really deep pockets. So, what is your point on this one again?