ICS upper gearbox upgrade questions.
 

Looking at mach1 I've found a complete and fairly cheap set to upgrade my upper gearbox with the ics split gearbox system. my main question is whats the difference between:

1) MC-71 Oversize cylinder (Full Capacity)
http://www.mach1airsoft.com/web/cata...om&id=74&cat=4

and

2) MC-58 Oversize cylinder (4 opening)
http://www.mach1airsoft.com/web/cata...om&id=73&cat=4

Do you own an ICS? those prices are for a full upper.

Full capacity is more for m16 length barrel and the ported is for m4 length.

M4 375mm barrel. split mechbox ics type is what I currently have. So don't bother getting the full? get the ported?

Ported

Can someone explain why so I know in the future. thanks

See the 1st stickied post in this forum section..."complicated...why match cylinder porting to barrel length"...something like that.

even easier. check airsoftparts.ca look at the modify cylinders. will show the proper porting for a range of inner barrel lengths.