Neglected to mention one major tactical advantage of the MP5/10 & 40. Setting aside caliber, it's faster reloading.
With a MP5 in 9mm, you depress the magazine catch button or paddle and rip the magazine out. With the 10 or 40, engaging the button or paddle and gravity does the work. Your hand is freed faster to grab and insert a fresh magazine. This is one reason why (besides caliber) that I would insist on the larger caliber weapon.
Regarding the bolt hold open, an item missing on its earlier 9mm counterparts, I never waited until I ran dry before reloading.
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