I have fairly long experience of the AR platform as a rifle, but am completely new to ARs in pistol length.

I’ve got 3 ARs in rifle configuration, 2x 5.56 and 1 .22, so I’m thinking about a pistol.

The longest range I expect to engage regularly will be 250 yards.

What am I giving up going with a 7.5 barrel vs a 10.5?