@TruthSandwich @trinsec

Depends on the subsonic you get.. A good subsonic uses the same amount of gunpowder but a heavier bullet to keep the energy the same but bring the velocity down to subsonic levels.

The problem with 300 blackout is they have too much energy and you have penetration issues again.

That said you are right that a 5.56/223 isnt the ideal caliber... personally if i wanted an ideal CQB I'd do an AR-15 chambered in 5.7. But I dont have one of those yet.