The SAF is a Junk-condition assault rifle and the most common gun in Oregon. Almost every faction carries one, so you will find them everywhere. No merchant sells it, so it never goes in your locker.
It is an early automatic for small Freaker packs and human fights. Ammo is easy to restock from fallen enemies. Aim for heads, since accuracy is poor.
Any bought rifle, like the MWS or US556, beats it and stays in your locker. Use the SAF until you can afford one.
.22 Repeater
The .22 Repeater is a Poor-condition primary rifle you unlock at Tucker's Hot Springs camp. It fires fast and its ammo is everywhere, but each shot hits soft. Use it for early Swarmer packs, then replace it.
Badlands Big Game
The Badlands Big Game is a Special Forces lever-action rifle for the primary slot. It reloads slowly, but every shot is accurate and heavy. It is a strong pick if you like to fight humans and big Freakers from range.
IDF Pup
The IDF Pup is a Special Forces bullpup rifle you get free for clearing Hordes. It unlocks at 50% of Horde Killer with a 45-round magazine. It is accurate, fast and one of the best primaries for Horde fights.
M14
The M14 is an Average-condition semi-automatic rifle sold at Lost Lake from Trust level 1. It fires quickly and accurately, which makes it good for picking off targets at a distance. An extended magazine takes it from 10 to 16 rounds.