an MP40, hmm. If I carry something that weighs like a rifle I want something that hits like a rifle. Namely, a rifle.
OK, excellent point. I went with the MP-40 because this is an overly vague question and the MP-40 is arguable one of the best 9mm subguns of it's day. So my answer, while not best for a practical carry, does fit the parameters of the OP. He asked what was the best 9mm, but did not say best for what. But, as you point out, it's a rifle (sort of) firing a little bullet. So, then... what will pack the punch of a rifle and still fit within the parameters of the OP? I know! Holland& Holland double rifle in....(drum roll)...... 369 Nitro Express. It's real close to a 9mm bore, and it's no doubt a rifle cartridge.
How's that? Do I get a cigar?
Not trying to offend anybody here in any way. Just having some fun on the internet.
