All rifles and LMGs have the same gun ability if you have at least a +1 bonus with it:
When targeting a body part during an attack roll, you roll with one less disadvantage.
Rifles and LMGs have the following calibers available to them:
Average, Finesse, & Heavy
MPK-5 : 110 Gold
1d10 Piercing, 80ft (240ft) Range
(4 Shots Until Reload)
AK-47 : 150 Gold
1d10 Piercing, 100ft (300ft) Range
(4 Shots Until Reload)
Anti-Material : 300 Gold
1d12 Piercing, 80ft (240ft) Range
(8 Shots Until Reload)