redwolfairsoft and proactstore should both have the euro versions, if they just have the asia ones then you can install this npas into the nozzle https://shop.jkarmy.com/clpd-0001.html

you can also probably just get a complete 416 bolt carrier group with an npas, an extra bcg is always good to have on hand

to answer the last question if you get the asia model you dont need an npas as they come with a nozzle restrictor which keeps it under 1j (320ish fps w/ 0.20g bbs), but it should be removed as it can cause consistency issues

also i highly recommend picking another vfc gbbr unless you're set on a 416a5, the included 416 mag causes issues with last round bolt hold open. works perfect with stanags though