So I bought 2 cm16 last week. I'm am looking at upgrading them a bit. I don't won't to do much just get them up to 400fps. Right now they are hitting in the 340-350 zone.
Stock inner barrel is a 6.08(I called g&g and asked) langthe is 275mm
Stock spring m110
Stock cylinder is ported midway through cylinder from what I understand
My thought was I would go to a m120 spring. is that will that alone push me up to the 400fps or will I need to go with a tight bore barrel as well?