Watch the video here: https://www.abbeysupply.com/airsoft-products/Abbey_Predator_Maintenance_Gas_144a.html
It's not for skirmishing, has a higher amount of lubricant so it's best not to put too much of it through the hop rubber. It's really only required if you have stored your mags with no gas in or used a very dry gas or propane all of which can contribute to your seals drying out.
Yeah....no.
Howard Leights are very good, but also check out the Earmor range. I have the M32H helmet mounted ones and they're very good. They do need their own PTT if you want to use them with comms as they work with "proper" style ones not the Ztac style. https://www.camoraids.com/product-tag/Opsmen/
Yeah. I like the rifle and the C4 rail is fin and all for a picatinny quad rail, but I'm a bit of an M-Lok fanboy now. The Centurion M-Lok rails don't look as nice as the MCMR one so...
BTCs are expensive and rarer than hens teeth (cue the hundreds of people that have "just got one for peanuts") but the Burst wizard ones are fairly cheap. https://www.airsoftworld.net/new-burst-wizard-3-mosfet-with-milsim.html
It's the Rate of Fire control that you want to look at.
https://gunfire.pl/product-eng-1152198440-CM032-SF-rifle-replica-black.html
£210 for a broken charging handle and two mags worth a fiver each or a brand new one for £154. Yeah...righto.
Not everyone wants and actual ballistic brain bucket but if you did, it's actually a fairly reasonable price (they retail at $1,400 new) especially with the earpro thrown in too (even assuming they're not actual 3M ones).