TM Mk23 Crazy jet barrel size?

[Allen428]

What size barrels are you using? Skirmish shop have 133mm 138mm and 150mm crazy jet barrels. I am going to get a tdc, h plate and a maple leaf hop rubber as well. 

 

[Allen428]

Also do you use single or double screw tdc?

 

[Steveocee]

I went for a single screw with H-Plate and currently running a 60deg autobot.

133mm is the standard barrel size.

150mm will poke out into your suppressor a bit (suppressor threaded bit may need a touch of drilling out to do this) and will increase your FPS a slight amount.