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Do you plan on switching the outer barrel lengths often?
If you are I suggest getting separate hop-up units/rubbers/inner barrels for each length you want to run. would save you a lot of time on each changeover.
The 12" JP handguard kit comes with 24", 20", 18" and 16" outer barrel lengths.
24" Barrel takes 650mm inner barrel. You will need an M16 bore-up cylinder kit.
20" Barrel takes 550mm inner barrel. Needs non-ported Type-0 cylinder
18" Barrel takes 509mm inner barrel. Needs non-ported Type-0 cylinder.
16" Barrel takes 455mm inner barrel. Needs non-ported Type-0 cylinder.
So if you're not going to utilize the 24" barrel you don't need to worry about the cylinder porting.
If you need a breakdown on the 7" JP handguard kit let me know.
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