Sounds like my grandfather, C3. He worked hard all his life outdoors, ate anything he wanted, smoked, chewed tobacco and always had a gallon of white lightning in the house. Back in the '80s I went back to NC for his 98th birthday and he was still in good shape. Mentally there, too, he could rattle off baseball players batting averages and talk to anyone. Six months later he died and I was so glad I made the time to visit him. I hope I got some lots of his genes!
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek