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Since I have a highly tuned TM m14 socom ill try to help you out
*Do brand names matter when it comes to spring guides? Prometheus, Guarder, Systema - is one really better than the other?
--Not really as long as its ball bearing
*Do brand names matter when it comes to bushings?
--Just get steel ones that are 6mm and you'll be fine make sure there bushings not bearings
*Which brand inner diameter tight bore should I go for, and I have heard that at 6.03mm and below the hop up stops working (the stock is a 6.04 barrel)?
--Stock barrel is 6.05mm i believe, so 6.03mm works quite well. My tightbore is 6.02 by damage and it works perfectly with the hopup, Im using a KM RH75 hopup rubber
*If the above is correct, will buying a new hop up unit solve the loss of the stock hop up at 6.03, allowing me to go tighter?
--You should definitely buy a new hopup sleeve if you want to goto around 500fps
*If the above is correct again, is it worth it getting a new hop up unit for the gun, I have read that it uses an aug style hop up, but are there any recommended brand names, or specific types of hop up I should be looking for, like 1 or 2 tipped?
--You dont need a new hopup unit just a better hopup rubber, You can get 2 tipped I used the Vcut KM RH75 and it works well by stablizing my bb's in the air with no dramatic left or right bb's
*What power spring would I need for that type of FPS, and is there any clear brand winner in that department, or at least brands to steer clear of?
--For brand springs Modify would work great, im guessing a M140 or M130 would work wonders for you..Or an airsoft surgeon stage 4 but that'd push you a little over 500fps. Stay clear of Systema brand springs, there prone to breaking.
*Would I need an Air seal nozzel for it, I'm not even 100% sure as to what it is, but are there any parts that people would recommend to reduce air loss and therefore increase power, or at least consistency.
--Air nozzle is a must or else your FPS will vary a lot, I'd go with promethus. That itself has raised my FPS by atleast 10-20 since it produces a much better seal on the cylinder head
I don't really know if I would need to upgrade the cylinder and cylinder head at that sort of FPS range, but in any case I can't for the life of me find out how long the cylinder is, and similarly I have been told by G&G that the cylinder head is 100% unique, and there are no after market parts for it.
--You probably wont need a cylinder head, just get a Sorbo Dampener from Tirador or airsoftparts.ca that'll work great and save your gearbox from breaking at high FPS
This is turning into a long first post, but I'll keep going!
With my current AEG it's all stock and although I get good distance on .25's it's lacking accuracy, BB's splay left and right more often than they do go dead straight, is this because of the barrel, the hop up or something else I'm overlooking?
--The far left and right spray is caused by either the nub is in your hopup is pushing on one side to much or the hopup rubber itself isnt centered. Or if your using low grade bb's
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