Hi all bit of a noob here (this may be a bit TL:DR)
First some background
So I only just got in Airsofting this year and enjoyed it so much i went and bought my own gun without consulting much (yeah i know stupid).
So I purchased a G&G M14 EBR short barrel from here: http://www.justbbguns.co.uk/product/529/AIRSOFT-GUNS-PRO/409/OTHER-PRO-GUNS/2289/GG-HBA-S
I plan to play with this gun on a balanced basis and chose it specifically because i can switch from DMRing to Assaulting so its kind of a medium to long range gun which suits my airsoft site well, I plan to get a PDW type weapon to fill the short range role later.
I also bought a harris style bi-pod and an extra G&G Mag.
Whilst i was at the JustBBGuns shop i also bought some batteries as the gun came without any, now i always preferred Lithium batteries over any other chemistry so decided to go for some LiPos, theses ones to be exact: http://www.justbbguns.co.uk/product/504/BATTERIES-AND-CHARGERS/268/LiPo-BATTERIES/2461/WE-1450MAH-11.1V-LIPO
Now you can't really read the specs on it from the picture on the website but its a WE 1450mAh 11.1 volts 25C, i also bought the correct charger for these batteries.
Out the box the gun fires about 310 to 320 FPS or about 0.9Joules using .2g BBs according to my X3200 Chronograph. Thinking this was a bit low i started to do some Googling and discovered conflicting reports of using LiPos, that they will strip the gearboxes, burn out motors, cause trigger arcing, explode on you whist charging (i have always known this about Lithium batteries).
But i also discovered that it can and should be upgraded, recommendations included shimming the gears, changing the spring, barrel, gears, motor, hop up, battery connectors, piston, piston head and a bunch of other things as well as adding a MOSFET.
At this time i know how to strip the weapon to pieces and put it back together (thanks to Youtube videos et al), I know it has a v7 gearbox with a V2/V3 gea rset but i don't know what piston, spring, barrel (though research suggests 6.04 tightbore) etc
So my questions are?
Is 310 - 320FPS ok? my sites limit for fully auto is 350FPS so my thinking is that this is a bit low Will my LiPo batteries kill my gun? Are they too powerful? I have heard horror stories of LiPos stripping gearboxes apart Should i upgrade the gearbox? If so what gear set would you recommend? Should i shim the gears? Should i get a MOSFET? If so what brand or model The piston and spring assembly, should i change those? Also how do I make the seal better? I the G&G stock motor decent? or should i upgrade this too? Should i change the barrel to a tighter one or leave it as it is? Should i change the hop up or even go for an R-hop? Should i changed the battery connectors from Tamiya to Deans? So far i don't see an issue with the Tamiya ones. Any other upgrades you can think of that will improve its performance?
TBH my main concern is that i am hoping my 11.1v LiPos don't kill my gun, and if it does strip the gearbox and piston apart too quickly then i'll know what bits i need, i am really looking at reliability, range and accuracy and consistent shots over ROF but don't want to kill the ROF too much. At this time assume that cost is not a problem as i won't be getting all these bits in one go.
Many thanks in advance, i know its a bit long winded but i would rather put all the info i know here in one go rather than have to answer the individually.