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Are you talking like an AR-15 chambered for a 9mm? No actual carbine is chambered for a "pistol round" (I assume you mean ammo such as the 9mm, .45, .40, etc.). Rifles that are modified to shoot smaller rounds such as the 9mm are typically done for fun, since they serve no real purpose otherwise.
SMG's such as the UMP45, MP5, and the such aren't rifles, but sub-machine guns which are just smaller weapons chambered for a smaller round, typically to be used in close quarters. Because of their size and the ability to put a lot of lead down range in a short period of time accurately, they're popular among the SWAT and SF community. The issue is their max effective range is typically only 50-100m. Nothing close to the M4's 500m.
And I don't believe there's a group for "all things guns" but if you have questions on anything involving weapons, feel free to message me. I've shot just about every gun you can name, along with having extensive knowledge in the field of firearms and self-defense.