There is an article on AllOutdoor.com talking about Heavy duty SHTF battle rifles. The picture used for the article shows an AR-10 next to an FN/FAL. Looking at the picture I have to ask myself, why do we need an AR-10 in a niche that is already full?
The right arm of the free world, the FN/FAL that has been in service since 1954. As of 2015 that is 61 years.
M1A, which is based off the M14, battle proven, reliable, marksmanship rifle has been in service since 1974. The M14 has been in service since 1959. As of 2015 that is 56 years.
PTR-91, based off the Heckler and Koch G3, in service since the year 2000, so only 15 years as of 2015. The Heckler and Koch G3 has been in service since 1959. So 56 years like the M1A.