A bit wobbly between upper and lower

Perhaps this has something do with the wretched, horribly made, gut wrenching quality of Bushmaster. lol
All joking aside, the connection between my upper and lower receiver is a little rattly. I don’t see any adverse affects on performance but it’s bothersome. Anybody have a solution to this? Perhaps better pivot and take-down pins?
Thanks e-world

Check here

https://www.m4carbine.net/showthread.php?t=25469

Been discussed.