Benjamin Prowler Barrel Play

Just got the Benjamin Prowler break barrel .22 and while target shooting the other day, I noticed some shots were extremely low compared to the grouping. Upon inspection just now, the barrel has a small bit of play where it can droop down a tiny little fraction while closed. The weight of the barrel itself can sometimes cause this droop while placing the foregrip onto the rest. I can double check and make sure the barrel is closed tight but I shouldnt have to.

Is there some sort of adjustment I can make to ensure that the barrel closes tightly/snugly and stays that way without having to worry about it?