Free: Contests & Raffles.
People want a gun to practice with so the use the cheaper 22 rds.
A tiny bit of security for some guys too as the anticipation of dopeys announcement built...
I just got a new AR 15-22 M and P rifle before the craze started. I was going to get a 10-22 but also wanted an AR someday. I went with the AR style so I could have the best of both worlds. Cheap shooting and AR style. I aked myself this also as I cant find any 22LR ammo now. Id love to know too?