Is this movement normal? (CR85R caliper)

I was cleaning up my sons bike today and noticed something I thought was odd. The rear caliper has a small amount of movement fore/aft. I did not notice any side to side movement though. Is this normal???? I've checked the axle tightness, but can't figure it out. LOOK HERE

The caliper has a cast flange that slides into a groove on the swing arm, a little free play is normal, depending on how much wear the part has. can't tell from the vid,but does seem to have too much. pull the wheel off and look for damage to the flange or groove.

i think so...all bikes rear calipers slide back & forth due to the rear wheel adjustment and when the shock compresses ..

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