You could also find some of that fancy tape in ACU or whatever and stick that around the mag well. An even better idea would be to get one of those rubber mag well grips. Those are some cheap alternatives.
though you may be poked fun at for the magwell grip unless it is on a sbr
Quis custodiet ipsos custodes?
Malo periculosam, libertatem quam quietam servitutem. --TJ