Depends on the money you want to spend. I have 4 fals and 1 mia bush rifle. If cash is no obtion, go for tha ar10 w/ plenty of mags. Or go Preban G91 H&K, Pre ban MIA/M14, pre FAL prefereble an Argentine. And then there is the Mega expensive GALIL or VALMENT. Stay away from the SAiga's. The need nodifications to worrk good w/ hicaps. Avepre is an ok alternative, and Kreb's custom can convert to galil mags. Look at the Dsa fals. An incredible weapon(Fal Type) Fals have the cheapest priced mags on the market. The most reliable would probable be the Galil. I am just going on the reviews I read from experts. my MIA never jammed. The Fals were finicky, but I had to adjust the gas tubes. They work great. I had two saigas, and the would only feed 6 or 7 rounds out of the 8rd mags. I traded them off to a guy that knew how to convert them to take the galil mags. If you got the cash, get three- MIa/m14-fn fal H7K 91.
If I needed a .308 in a pinch-Springfield Mia. That is just my opinion. The MIA mags are the most durable that I handled.