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The MP5SD barrel is ported to reduce the velocity of 115gr ball to subsonic.
There is no reason LE should use 115gr ball, much less at reduced velocity. LE use that requires subsonic stealth seems a bit of a stretch, especially with reduced terminal performance trade off.
The big reason is that factory 147gr HP ammo is subsonic in a standard barrel, AND designed for terminal performance at that velocity. So you can have quiet and terminal performance.
The calculus is a little different for non-LE folks when one considers the cost of a 5.56mm carbine or SBR versus an MP5.
I think Mr. Hackathorn's article makes a good argument for downplaying some of the supposed justifications for switching from the MP5 to the M4 or SBR type platforms. I think he overplays the difference in size - the picture shows a 14.5" or 16" carbine with a suppressor, versus a MP5 without a suppressor and with a retractable stock, retracted. Not a fair comparison. The difference between a 10.5" carbine and a MP5 with a fixed stock is minimal.
He also notes the danger of 5.56 penetrating soft armor. Of course, this is also an advantage depending on what you are facing.
Aside from cost, I'm not real fond of the MP5 in terms of ergonomics (safety) and manual of arms (reloading an empty gun).
Last edited by dbrowne1; 01-01-10 at 16:20.
How does it compare to the KAC 6x35mm?
That is indeed an unhelpful photo. Extend the stock on the MP5 and add a suppressor, and the guns are nearly the same length.
What I gathered from that portion of the article is that the MP5 is a safer choice, because cops have a tendency to shoot other cops. Gosh, how about we don't do that?He also notes the danger of 5.56 penetrating soft armor. Of course, this is also an advantage depending on what you are facing.
(And while we're at it, how about we help accomplish that by getting serious about NDs, too. Really serious. Like loss of pay. Time off. No more SWAT. Lose your G-ride. Being the meter-maid.)
Another thought: Wasn't it the NTOA (or maybe ITEMS) that crunched the data on ops injuries and OISs, and found that when cops shoot other cops in the tactical environment, it was mostly lower extremity injuries, where armor would not play a role anyway? That would seem to negate the comparative safety margin of the HK a bit.
From the article:
In addition, the instructional norm with the HK was to have troop run with the safety off rather than on when the gun was or about to be in play. The norm is the opposite with the M16/AR type, as the safety is easily accessible from the firing grip for the majority of shooters. Those running ARs safety off seem to be folks that transitioned from the HK. This difference would seem to be helpful as well.However, the most important drawback to the M4 is the often overlooked fact that if one of the team members is armed with a .223, there is at least one weapon present that can penetrate most police body armor. Accidents happen, and the level of injuries related to friendly fire in police shoot-outs is often a hidden statistic. The Emergency Services Unit (ESU) of the NYPD, easily the team with the most number of callouts in the nation, still issues MP5s. Why? As one team leader said, “We don’t want to kill one of our own guys. An M4 can do that, but an MP5 can’t.”
Last edited by ST911; 01-02-10 at 12:09.
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6x35 mm fired from an 8" barrel performs dramatically better than 9 mm from an MP5; for that matter 6x35 mm terminal performance is also superior to 10mm from an MP5/10.
Last edited by DocGKR; 01-02-10 at 02:28.
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