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.
Hot SpringsHot Springs is Ada Tucker's work camp in Belknap, set in an old luxury resort on a dormant volcano. Go here for Alkai Turner's weapons and Belknap jobs, but expect hard rules: Tucker runs it with guards and forced labor.Buy the grade the camp you are at offers. Each higher grade adds one shell and better condition. Stats are otherwise the same.
It gives you shotgun damage while riding, which no primary shotgun can do. It also covers close range when your primary is a sniper or LMG.
Captain Kouri gives you a Pristine Lil' Stubby after a story cutscene. Hold off buying the top grade until you get there.
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.
SMP9
The SMP9 is an automatic sidearm with a 30-round magazine. You can buy it at Hot Springs or Lost Lake, or get a better Mil-Spec copy free from Horde Killer. Full-auto in the sidearm slot is great on the bike.
.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.
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.