The Crowdbreaker is a bullpup double-barrel shotgun with two tube magazines and 16 shells. Blair sells it at Lost Lake from Trust level 2. It fires slowly but rarely needs a reload, which makes it a strong pick for close fights.
It keeps firing through a long close-range fight without a reload break. Use it in Infestation zones, tight buildings and caves. Accuracy is very low, so stay close.
The Combat Shotgun holds fewer shells but groups tighter. The Auto Shotgun fires much faster. The Crowdbreaker is the pick if you hate reloading.
C8 Rifle
The C8 Rifle is an Average-condition semi-automatic sniper rifle for the special slot. It lets you take precise shots from far away. The Lost Lake merchant sells a magazine upgrade that takes it from 5 to 7 rounds.
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.
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.