Sorry I meant to say mag well/body, at least I assume that is what it attached to, it doesn't help much otherwise as you said, I haven't got one so can't say for sure
Due to tight budget i think i am gonna play it safe with a PEQ box.... Later on meny i have a but more spare money i might try tht ready mag system Matt was on about
A few years ago my dad bought a JG M4 CQB and upgraded it like crazy. The ressualt was a really well performing rifle that kicked the hell out of some of the more expensive guns!