I've held on to most of the guns I've bought since 1971 and also added newer models. Best of both worlds!
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek
I started in guns at age 8 when my dad intoduced me to his winchester model 72, .22lr. I put about 1000 rounds thru it up until he gave it to me at age 24. My Dad never owned a hand gun. But when I left the country for the city in 1999, I bought my first handgun. Now I own four of them.
This year I bought my first AR platform. I was in the Army for 20 years, and can teardown a M-16 or M-4 way beyond field strip.
So I bought a stripped lower and built my AR-15. It is much like a M-4 but no full auto. Or auto burst.
Having said that, it is a hoot to shoot. But it will spend a lot of time in the safe, until the day that the government goes over the line.
No one will ever get into my gun safe. Not as long as I live. Unless the horrible thing happens.
Doin' what I can, with what I got.