Known as Senate Bill 435, aka the PA Assault Weapons ban, it goes far deeper than a simple ban on 'Assault Weapons' a term that is loosely defined at best and not defined at all at worst. The bill defines an assault weapon as the following:
(1) A semiautomatic center fire rifle capable of accepting detachable magazines and a pistol grip protruding conspicuously below the weapon's action, a thumbhole stock or folding or telescopic stock; a flash suppressor, grenade launcher or flare launcher; or a forward pistol grip.
(2) A semiautomatic center fire rifle with overall length of less than 30 inches.
(3) A semiautomatic center fire rifle with a fixed magazine capable of holding over ten rounds of ammunition.
(4) A semiautomatic pistol capable of accepting detachable magazines and a threaded barrel; a second handgrip; a capacity to accept a detachable magazine at some location outside the pistol grip; or a shroud attached to, or partially or completely encircling, the barrel allowing the bearer to fire the weapon without burning the bearer's hand, except for a slide enclosing the barrel.
(5) A semiautomatic pistol with a fixed magazine having the capacity to accept over ten rounds.
(6) A semiautomatic shotgun having a folding or telescoping stock; a pistol grip protruding conspicuously beneath the action of the weapon, a thumbhole stock or a vertical handgrip.
(7) A semiautomatic shotgun with the ability to accept detachable magazines.
(8) A shotgun with a revolving cylinder.
"Large capacity magazine." Any detachable ammunition feeding device with the capacity to accept more than ten rounds of ammunition. The term does not include any of the following:
(1) a feeding device that has been permanently altered so that it cannot accommodate more than ten rounds;
(2) a .22 caliber tube ammunition feeding device; or
(3) a tubular magazine that is contained in a lever action firearm.
Another fantastic way to show your legislators that you are in support of the second amendment is to go to the capital in Harrisburg on April 23, 2013 for the Annual Second Amendment Action Day. Information on the event can be found here. Forum posts on PAFOA can be found here.
As a side note, I cannot endorse or guarantee the accuracy of any information found on external links so please use caution when following any advice or directions given on the links.
Be aware that all of these bills can and will have an immediate effect on your right to buy regular Class I weapons and will ultimately have an effect on your ability to purchase and own Class III weapons. The time to make your voice and vote heard is now.