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.
Buy it from the Hot Springs gun merchant once Trust there reaches level 1. Any copy you pick up in the world is not saved until you buy it, so lose it and it is gone.
It handles small groups of Swarmers and the smaller Infestation zones. Plan on headshots, because body hits barely slow anything down. Leave it at home for Breakers and Hordes.
It beats the M7 on rate of fire, since it is semi-automatic instead of bolt-action. The M14 from Lost Lake does the same job with more punch and a bigger magazine. Swap as soon as you can afford it.
Combat Shotgun
The Combat Shotgun is a Military Spec pump-action shotgun sold at Hot Springs from Trust level 3. It hits hard with a tight spread and holds 9 shells. It is the best buyable pump gun in the north.
Frag Grenade
The Frag Grenade is a military fragmentation grenade you cannot craft. Hot Springs, Lost Lake and Wizard Island sell them from Trust level 3. Use them on human groups behind cover and on tight Freaker packs.
Lil' Stubby
Lil' Stubby is a sawn-off lever-action shotgun that fits the sidearm slot. It comes in three grades, Poor, Better and Pristine, each sold at a different camp. As a sidearm, you can fire it from the bike.
MWS
The MWS is an Average-condition rifle sold at Hot Springs from Trust level 2. It is a clear step up at close to mid range with a 35-round magazine. It makes a solid primary for the middle of the north.