Got to thinking... Yea it could be dangerous haha..
Tryin to figure out a way to get cheap high velocity ammo to go subsonic out of a 16.25" barrel.
Then i remembered that the mp5-sd barrel is ported to release pressure to slow the round down.
I have a extra barrel that i can chop down to 16.25 and do some testing. Thought bout startin by drilling 1/16" holes down the top of the barrel, testing with a chrono after each to see how much it helped.
Think it will work? Wonder if the ports will clog up over time?