[My roommate’s opinion-he’s the resident gun nut in this household]
I tend to disagree with some the aforementioned statements. Please bear with me, as I will try and deal with each of these statements.
First, the firepower issue. If you are referring to standard 9mm 115gr FMJ listed at a velocity of 1150 fps, you are right. However, these rounds do not generate enough force to reliably cycle the action. US Special Forces, and many law enforcement agencies, use 124 gr +P+ pressure rounds (the US military using FMJ as required by Geneva Accords and LE depts using JHPs). The HK MP5, especially the Navy and SD variants, are preferred for MOUT applications. This weapon does have a place on the modern battlefield, and it does not appear to be leaving the battlefield anytime soon.
Secondly, it has been stated that the 9mm is useless for anything other than pistols. The 9mm is a versatile round when loaded with a quality dependable bullet that offers depth of penetration. The 124 grain and 147 grain Federal Hydra-Shok JHPs come to mind, as do Remington Golden Saber bullets (my personal fave). The 115 gr bullet at 1150 fps is a bit anemic as it generally does not offer adequate penetration. The 9mm is considered the quintessential SMG round, as there have been many weapons chambered for this round. To name a few, the Sterling series of SMG, the German Wehrmacht MP38 and MP40, as well as the Valmet SMG and S/W Model 76. The catch with the 9mm SMG round is that it must reliably cycle the action. The 5.56mm cartridge is a very versatile round, but it must utilize a full-length rifle barrel to make full use of velocity for downrange performance and penetration. The 14.5 inch M4 barrel reduces the M16-platform to little more than a 22 WMR in terms of ballistic performance. The M16A1 and M16A2 rifles offer better performance with the 5.56mm round, especially in the loadings of M855 bal and Mk 262 Mod 0 and Mod 1 loadings. Otherwise, to compare the 9mm Luger and 5.56mm NATO cartridges is to compare apples and oranges.
The MP5 weapon itself is reliable and utilitarian, which is why it appeals to LE and military operatives. A dent in a receiver will render any weapon useless, even an M16 variant. As for rifle receivers, I prefer mine to be made from beer cans as opposed to paper towels.
It has also been said that the original MP5 “had no rail attachement points that would be essential on any modern infantry weapon”. Neither did the M16, especially the A1 and A2 models. These developments are a product of the post-Desert Storm military world.
However, on one point I will agree with KTB. The delayed blowback system requires very little cleaning. Thank God for roller-locking mechanisms.
As for “no one important” using these weapons anymore, I will politley refer you to the Jacksonville Sheriff’s Office SWAT team, LAPD SWAT, The FBI, US SECret Sevice, and the United States Special Operations Command, commonly known as SOCOM.
I apologize for being a bit long-winded, but I felt it necessary to support my statements. Thank you for your patience.