Just the law in PA. Semi Automatics are not allowed. With the exception of shotguns plugged to 3 shot limit (1 in the chamber 2 in the magazine).
Straight out of the PA code.
Sec. 2308. Unlawful devices and methods.
(a) General rule. - Except as otherwise provided in this title, it is unlawful for any person to hunt or aid, abet, assist or conspire to hunt any game or wildlife through the use of: