bass drum pedals

if you order a bass drum pedal from music 123 do you also get a beater?.....

Mostly all new pedals include a beater. Shouldn't have to worry about that.
Which one are you getting?

im getting a Yamaha 7210 Chain Drive Single Bass Drum Pedal

Good solid choice! I played a Yamaha 7-series pedal years ago. When I bought it, it had a beater too. In fact, I didn't have to adjust it either, I put it on the drum and played it that way. Yamaha stuff just works. Although these days I play Sonor hardware, and have been a DW fan for some years as well.