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My main questions are what things do I need to keep track of on the AR platform? Small parts and springs and the like, also how much should I clean?
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Nothing. Keep your normal maintenance, cleaning, and lubrication cycle.
Springs, keep an extra piston return spring on hand. Some say replace every 5,000 rounds as a measure of safety but it's not necessary.
Otherwise, all other springs and and moving parts require the same inspection and replacement periods as a DI AR
I have been simply cleaning it after every use at this point (about 500 rounds fired each outing so far) not had a problem yet but am unsure if I should be spraying lube in it during use?
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Depending on the environment factors, there's no need to relube a piston gun every 500 rounds - but there's no harm in doing it either. Because pistons keep the heat and fouling forward of the BCG, it increases the working life of the lubricants versus had they been subjected to the heat cycling and fouling in a DI rifle.
My other question is about the precision I should be expecting,
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Inherit precision will be no different than a like-for-like DI gun. Ammunition will play a role in your accuracy. Steel case has never been known for it's accuracy and repeatability.
Yes, you may have to play around with a few different ammunition manufacturers to figure out which your rifle likes the best in so much as repeatable precision.
If however, you know you're a good marksmen and you cannot seem to get consistent groups no matter what ammunition you have tried, it could signal a symptom with the barrel or gun and I would call LWRC to have it torn down and inspected.
Finally what parts should I consider upgrading? I was leaning toward a JP buffer spring system and perhaps a NIB coated bolt to go with the carrier. I'm mostly just new to the ARs aside from long range bench rest sort of use, trying to learn about the platform more and especially in more high volume use case.
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Upgrading is really a what do you do like and how much do you want to spend sort of thing? If upgrading I want parts that (a) make the rifle more reliable (b) Increase precision (c) decrease recoil.
I don't know if JP would fit all of those constraints, but there's certainly nothing wrong with their buffers.
Without getting into too much chemistry jargon, I would not recommend NiB. NiB is an inferior coating (except for the gold color - the gold color is really cool looking, but it also signifies that the coating properties are lessening. )
NP3 has a host of properties that make it superior as compared to NiB, Chrome, Melonite, etc. .