I'm planning to build a 7.62x39 10.5" AR pistol as a truck gun/home defense gun. So it needs to be as light and snag free as possible but also 110% reliable.

In shooting centerfire AR carbines I never use F/A and in fact have several carbines without F/A.

Since shooting an unshouldered AR pistol vs an AR carbine is similar to "limp wristing" a conventional semi auto pistol, Does the need for F/A arise more often with AR pistols?