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Things that matter: compression parts (seals, mostly), hop rubber, barrel, brand and weight of BBs.
If you have a $200 gun that shoots 1.6j, has perfect compression (no air leaks), prometheus barrel with R hop and you're using good .3g BBs, then you'll be shooting as good as a gun with $400 of extra crap in it's mechbox.
Your compression parts and barrel group are your range and accuracy.
Then you match your muzzle energy (or fps) to an ammo weight; like at 400fps on a .20 (1.48j), you'll be wanting to use .30 or .28g BBs.
The rest of the internals just augment reliability, rate of fire, trigger response, and/or electrical efficiency.
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