So im looking to upgrade my g&g m4 cqb-s I put a 6.03 300mm barrel it came with a 6.04 275mm.
My question is what spring is good to get I was looking at a m120.
The guns at 356fps on 0.20bbs I would like to be at that using a heavier bbs .25 or .28 my goal is to get nice range and accuracy
thank you for reading and helping me on this
