TacMaster  
I take it you mean 'buy' a normal AEG? Just to clarify. 
  
I look at all these difference guns, a lot of the guns I see look great externally. But when it comes to internal stuff I am absolutely  lost. I've tried finding written reviews but find it difficult. It's easier to find YouTube reviews but have heard not to trust  as some are sponsored. 
  
All I want is a solid gun in mostly metal , that will function and perform without any major internal upgrades, it needs to be able to shoot no more than 350fps. I know G&g and ICS are decent  makes... But there are so many to choose from? How can someone like myself with very limited experience know what to look for 
  
What would you choose!? Presumably most people will choose m4 as it's been said to be easier to upgrade internally.