Starting to mod King Arms M4A1

[Smodes]

I'm looking to start upgrading my gun (internals) to get more distance out of it. Its the full metal but its stock right now though. If anyone could give me suggestions I'd appreciate it.

[Stealth]

Start here. Read it. Search existing threads. There are A LOT of threads discussing the same thing. The KA M4 isn't unlike basically 95% of all other M4s on the market.
Read some more, and then ask more specific questions.

http://www.airsoftcanada.com/showthr...ight=king+arms

[Hectic]

Based on what i seen at the ZAWC Id say get that thing chronied (unless youve done it recently it seems it may be shooting way low maybe bad air seal or flat spring.
If you have recently chronied it or if you search "pop can chrony" on google and try that out to get an idea of what its shooting (no its not all that accurate but use a real pop can like coke or pepsi not the non name brand stuff) once you find that out then itll be the next step.
Firstly if its shooting way low figure out why. Air seal?
Or spring issues.
Then if its air seal figure out why/where the leak is.
Cylender head, hop up to nozzle seal maybe even bad rubber on piston head.
Then adjust/correct the issue.
Or if you just wanna dive right in se the link in Stealth's signature and grab a V2 lonex drop in box in whatever flavor you want. (120 spring is prolly max youll want)
Grab a lonex hop up unit.
Then head over to airsoftparts.ca and grab a nice inner barrel swap all that crao in and youll have a brand new aeg lol.
Either way works well depending on budget. If your not handy and diagnostics then just go full drop in and sell or keep your old parts to mess around with (learn how to build a gearbox).
That or the othet option is to just take it to a gun doc to sort out the issue.
As for baisic upgrades the first thing i do to all my aegs is swap out the inner barrel with a good tightbore and replace the hop up rubber with a madbull or lonex or prometheus.