On my main gun I use the 400 round hopper for a force multiplier on my team I am cover support. I also run a scepter launcher to put smoke and paint grenades down range. My 98 M4 I use a X7 hopper and my X7 MP5 I use a custom 100 round tac cap and stock 200 round. My BT TM 7 I use a Magna Drive loader.