Hi everybody, i bought a TM M4 about 6ish years ago and due to the rarity of my opportunities to game it's still has all it's standard parts so now that i'm getting into airsoft more seriously i'd love some suggestions for upgrades i'm more interested in improving range over rate of fire as the site i most regularly visit is the Mall and it's single shot over a lot of the site and has a max fps of 340. Thanks in advance.