imported post
Speaking to the 5.7mm round, I have never been impressed with the round. A micro rifle round in a pistol (?), when our guys in Iraq are already pissed about the .223 and it's lack of stopping power.
So I began to research the thing. I quote from the Box O' Truth website:
"Also useful is that while doing the Buick of Truth shoot I was talking to some members of a very large and very well respected SWAT team who has had more operational use of the weapons than any other group in the United States, and they were absolutely sour on the weapon.
One of them told me about a particular incident where two SWAT officers, one armed with a shotgun and the other armed with a P90, engaged a bad guy. The P90 armed officer was the first to engage the bad guy....which caused the bad guy to start hollering "Stop shooting me with that thing!!" after sustaining multiple hits with the weapon.
The officer with the 12 gauge used his weapon and the bad guy was dropped instantly and apparently no longer had the ability to complain about what he was being shot with.
Another member of that same team recently posted on another forum that his team was in a firefight where the P90 was used again. The officer armed with the P90 fired on a bad guy...but the round was stopped by the bad guy's rib.
Scientific gel testing has shown the 5.7 to offer pretty poor ballistic performance when compared to the 5.56 or even to more common handgun/subgun rounds like the 9mm and the .45 ACP.
The benefit of the 5.7 round is that it reputedly penetrates body armor...but only with rounds available to LE/military that ordinary civilians cannot get. Even then, there are AP rounds for more common handgun/subgun calibers (9mm, .45 ACP) that will also penetrate body armor and give superior terminal ballistic performance.
When you combine the results of scientific testing with the observed results of real life firefights the worries about it being a weak penetrator and a bad choice for stopping the hostile actions of a bad guy seem to be solidly founded. "
The round, though new, just does not seem to be passing the smell test. If it were, you would have guys crowing about how the round just puts 'em down. Instead, you have this impression that they are really cool in full auto (P90) but the round they fire sucks.