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With an M130 you don't actually need any other upgrades. I ran a TM VSR-10 for a full year with just an M130 and tightbore and no signs of wear or damage. There's a user on airsoftretreat.com that did a test with a VSR-10 and M130 and no other upgrades with over 1000 shots fired and similar results.
If you're on a tight budget I'd recommend: Laylax M130 spring, Laylax 6.03mm tightbore (readily available and best bang for the buck IMO) and Firefly hard hop bucking (emphasis on the hard version)
That should be about $100 US and would give you a reliable and decently accurate rifle.
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