This evening after our monthly meeting the regional SWAT made up of officers from 38 different cities and towns put on a demonstration for us.
There were 28 SWAT members in 3 armored vehicles. They displayed lots of their gear for us to see and touch from bullet proof vests, kevlar helmets to night vision. They outlined rooms of a house with a door frame on our range. They breached the door twice for us and demonstrated how they clear the rooms.
They used explosives

Then they used a battering ram to gain entry and tossed a couple of "flash bang grenades"...WOW...I still see white dots

Finally, they pulled out a couple of suppressed MP4s and emptied a couple of magazines... :-/...all we heard was the stutter of the bolt and the "pling", "pling" of the steel targets they were shooting at in the "house". Really cool stuff.
Great time, nice guys, well trained...I was impressed. :-* :-*