Sub-compact weapons, commonly known as sub-machine guns, are small caliber, fast firing weapons used for close-quarters engagements. They are best used within 100 yards of the shooter, as the low caliber(s) used in these weapons will not have much range. The most common SMG uses a 9mm round, with anywhere from a 10-50 round magazine. This is so that you can engage a threat without worrying too much about where the round will end up. 9mm rounds tend to begin a "tumble" motion at a distance of about 30-45 feet after leaving the barrel. Most 9mm rounds are low grain, low density so as to cause a large effect on the target without penetrating the target itself. 9mm rounds tend to stay lodged in the body, bouncing around a bit before settling into the wound cavity. This effect is also seen with .38 caliber pistols, but that's a different subject. 9mm rounds are cheaper than higher caliber rifle rounds, and can be bought in boxes of 20, 50 or 100 rounds(Specific places referenced, not available in 100 round boxes everywhere.) This allows you to stock up on several thousand rounds without having to pay a fortune. It's nice to have a large amount of ammunition in case the time comes where you need to protect yourself and your rations.
Now, let's talk models. The military, such as SEAL teams and other special forces units, use variants of the H&K MP5. With a 30 round clip, ambidextrous magazine release, and fully functional iron sights, the MP5 is a very formidable weapon system. The newer design, the MP7, is the same as the MP5 in many aspects, such as cartridge size and clip size, however very different in the design. The MP7 is a fully automatic smg, whereas the MP5 has single fire and automatic. The mp7 is much lighter, more compact, and features an adjustable stock and folding stock compatibility. If a higher fire rate is what you're after, then pick up the M11 machine pistol. 50 rounds of pure 9mm stopping power coupled with an unbelievably fast rate of fire make the M11 a perfect weapon for those who would rather "spray and pray" than have to take the time to be accurate. Finally, if you want the best of both worlds, pick up the FN P90. Featuring a fully ambidextrous magazine release, selector switch, and charging handle, plus the added benefit of a verticle ejection port, the FN P90 is one hell of a weapon system. Chambered in 9mm or .45 caliber, this weapon packs a balanced punch. With a fire rate that is unmatched by the MP5, but more controllable than the M11, it is loved by military and civilians alike. The bullpup design makes the P90 comfortable to handle, easy to fire, and easy to handle. The magazine is located at the top of the system, and the ejection port is located at the bottom, making for a smooth reload and no worries of hot cartridges winding up where they aren't wanted.
That's all for now folks, hope you enjoyed the read and hopefully you feel more prepared as to which weapon system is right for you. Next week, I'll cover small caliber pistols.
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