Special purpose rifle m4 miss feeding

Lovely when working Special purpose rifle M4 Miss feeding but fires Not sure if it's just wrong mags or maybe needsnew hopup rubber should be easy fix Clearing out all airsoft stuff Have young kids n no space or time to fix Rail is slightly lose been using a scope to keep it tight and aligned works fine will throw in a scope 4 that reason Also throw in 7.4 battery n front fore grip All metal looks n feels authentic