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I have one here. I'd say the mandatory upgrades are cylinder head, barrel and rubber. It uses APS2 cylinder heads, and VSR barrels and rubbers. I used PDI parts in this one. The other parts of the gun seem to be good enough, but from there you will find most benefit in mods rather than upgrade parts: barrel spacers, flat nub and TDC mod at the least. Also, on this one, I had to file down part of the bolt handle because it was rubbing on the receiver, creating an offset between the trigger assembly and the piston sometimes resulting in the gun failing to fire. I've heard of at least one other with that problem so it may be something worth looking in to.
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