Here it is:
http://www.thehighroad.org/showthread.php?t=134421
25 (5) "50 caliber cartridge" means a cartridge in 50
26 caliber, either by designation or actual measurement,
27 including but not limited to a .50 BMG cartridge, that is
28 capable of being fired from a centerfire rifle. The term
29 "50 caliber cartridge" does not include any memorabilia or
30 display item that is filled with a permanent inert
31 substance or that is otherwise permanently altered in a
32 manner that prevents ready modification for use as live
33 ammunition.
34 (b) Except as provided in subsection (d), 90 days after the
09400HB2414ham001 - 4 - LRB094 09150 RLC 44469 a
1 effective date of this amendatory Act of the 94th General
2 Assembly, it is unlawful for any person within this State, to
3 knowingly manufacture, deliver, sell, purchase, or possess or
4 cause to be manufactured, delivered, sold, purchased, or
5 possessed, a semiautomatic assault weapon, an assault weapon
6 attachment, or any 50 caliber rifle.
7 (c) Any person who knowingly possesses a semiautomatic
8 assault weapon, assault weapon attachment, or any 50 caliber
9 rifle must, within 90 days after the effective date of this
10 amendatory Act of the 94th General Assembly, destroy the weapon
11 or attachment, render it permanently inoperable, relinquish it
12 to a law enforcement agency, or remove it from this State.
"50 caliber cartridge" means a cartridge in 50
26 caliber, either by designation or actual measurement,
27 including but not limited to a .50 BMG cartridge, that is
28 capable of being fired from a centerfire rifle.
So if there is a rifle chambered for the 500 (I dunno if there is?), it looks verboten.
(c) Any person who knowingly possesses a semiautomatic
8 assault weapon, assault weapon attachment, or any 50 caliber
9 rifle must, within 90 days after the effective date of this
10 amendatory Act of the 94th General Assembly, destroy the weapon
11 or attachment, render it permanently inoperable, relinquish it
12 to a law enforcement agency, or remove it from this State.
...
29 (1) A person who manufactures, possesses, or delivers a
30 semiautomatic assault weapon in violation of this Section
31 commits a Class 3 felony for a first violation and a Class
32 2 felony for a second or subsequent violation or for the
33 possession or delivery of 2 or more of these weapons at the
34 same time.
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1 (2) A person who possesses or delivers in violation of
2 this Section an assault weapon attachment commits a Class 4
3 felony for a first violation and a Class 3 felony for a
4 second or subsequent violation.
5 (3) A person who manufactures, possesses, or delivers
6 in violation of this Section a 50 caliber rifle commits a
7 Class 4 felony.
Yep. Confiscation/destruction/removal is mandatory. Instant Class 4 Felon (whatever that is) for noncompliance. Then again, it does say rifle.