Barrel length and cylinder size?
 

If I upgrade from the stock 363mm barrel (ics m4) to a 407 mm barrel, do I need to change out the stock 4/5 cylinder (to say a stock full cylinder)?

From what i searched, it seams like both barrel sizes are close enough to use the same size cylinder.

Just wondering if anybody knows a little more?

thanks

no.

you're right.

yes.