what ya need subsonics for??
if your shooting a pistol with barrel length of 4.5" or less standard velocity becomes subsonic. only need i can think of is for a suppressor on a 5 inch+ barrel. some integral suppressed 10/22 barrels bleed off enough gasses to make standard velocity rounds subsonic.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent