[The Saint]

You might want to consider saving up and just buying G36 full length front end instead of this, because it'll be exactly the same amount of trouble switching between the sniper and assault config. After all, you'll need to completely remove the front end to switch inner barrel, unless you're going to use your stock inner barrel with the sniper config, which obviously wouldn't give you any sort of sniper-ish performance.

Actually, considering that you've got a G36C as it is, simplying adding a longer inner barrel actually won't do much in terms of performance improvement, since you've got a ported cylinder (unless you've upgraded it).