The factory integrally suppressed MP-5SD has holes drilled into the barrel to bleed off gas...all full power 9mm bullets comes out of its muzzle at subsonic velocity because of that. Operators have had failures to stop with the SD model because unlike the other MP-5 models it has basically the power of a
.380acp(all the time) also the decible reduction of the integral suppressor is no longer close to state of the art. That is why you dont see the SD all that much anymore...everyone uses a regular MP-5 with a QD muzzle can and 147gr hollow points instead.
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Lighten up Francis!.....;Actor Warren Oats, in the movie "Stripes"
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