[Bubbahoetep]

Hey guys, I currently run a stock inner barrel in my Kingarms M4A1 and was thinking of getting a longer inner barrel to equip with my suppressor (having my suppressor covering the exposed section of my inner barrel).

So my questions are,

1) Do I buy a inner barrel the length of my outer barrel with suppressor on it (509mm)?

2) What is the most recommended bore for improved accuracy and range without effecting FPS to much?

This photo shows what I am planning on accomplishing.

Any help is appreciated.