That's subjective and even if price and 'bestness' was the only 2 actual variables (which it isn't) then it's never a directly proportional relationship between the 2 in anything, not just airsoft. Supercars don't go ten thousand times faster than normal cars.
Furniture
- receiver threads and buffer tube are AEG compatible
- pistol grip is AEG compatible but some need the base plate or the top of the grip modding (this is common in airsoft guns in general)
- outer barrels are WA GBB style (VFC ones tend to fit the best.
So buy what you want from from many airsoft shops as long as you can fit a battery in the stock.
Performance
- GBLS do various power springs (available through their dealers)
- bucking is AEG compatible
- inner barrel is AEG compatible
- as standard the nub is built into the hop arm, but you can either mod the stock arm, or purchase an off the shelf replacement which can take AEG nubs
So really, the bits that really matter in performance of sending the BB downrange are compatible with a lot of what's on the market already, the stock internals are built to handle over 400fps, they are way tougher and built to much tighter tolerances than most other AEG parts. The only thing you wouldn't want to do is mess with the ROF as there is a balance that needs to be kept with the cycle times of the whole gun.
GBLS production is based in Korea, but we buy from the UK distributor who as I mentioned, hold stock in the UK.
Already hijacked this thread enough, so if anyone has other questions, feel to message us or start another thread.