I am new in this sport so I am looking to purchase my first gun, I've been doing my research on brands, models, upgrades and so on.
So basically I have this clear idea on my head to get an assault rifle first. Personally I like the H&K G36K but when it comes to airsoft it could be a complete different story I don't want to purchase a "good looking" gun but functionally weak or unreliable, so Tokyo Marui manufactures the G36K and found that fires relatively same FPS everytime. But what other aspects should I look for in a gun?
For the experts what guns (models and brands) would you recommend me for being reliable and also versatile to be mechanically upgraded? on the range of £300-500. Because besides practising this sport I found interesting as a hobby to have a gun I can customise and upgrade. If the G36K is not versatile in terms of upgrading gears, motors, and so on I would look for an M4-Ar15 model or similar.