Need Help Upgrading My TM 416D to DMR

[Forge]

Hello Airsofters

I bought my TM 416D a couple weeks ago and after getting the hang of it decided to lay down some money to buy upgrades.
I have a very rough idea of what i would want but i would much rather get advice from users who have had the gun for longer.
What I am looking for is to turn my 416 into a DMR or any upgrades that will increase FPS,Range and Accuracy.
I dont really want to mess with the gearbox too much (It is a TM after all).

Thank You