I played with Kyle Lambs VTAC rifle when I attended his 1.5 course. I was amazed at how light the weapon was. The only thing I'd wish for is that it was a mid-length barrel instead of a carbine (personal preference).
As far as barrel wear, I wouldn't worry about it. The average barrel life is 20K to 30K. The Bolt parts (extractor, extractor spring, black insert,) will start to wear first and will need to be replaced, depending on the rounds fired and hard (a carbine course) VS light usage. The Gas Key (Depending if it was properly staked) and Bolt lugs (Crack or Sheer off) will start to fail at higher round counts. I start to detail inspect for serviceability, around the 4-5K mark, then every 2K after that. Expect the extractor to go first around the 5K mark. If the weapon starts to Fail to Feed, replace the entire extractor, spring and insert. Replace the buffer and action/buffer spring, when it starts to short stroke. Just keep the BCG well lubed and clean it as you see fit. As always, anything can break at anytime and they don't normally stick to a fixed schedule to break.
For God and the soldier we adore, In time of danger, not before! The danger passed, and all things righted, God is forgotten and the soldier slighted." - Rudyard Kipling
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