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L4D2 Weapon Upgrades

I simply don't care whoever have made it or not, this is just my own version.
Adds four entites from L4D2, in other words, those three weapon upgrade kits.
Entities are located in "Left 4 Dead 2" tab.
Only supports weapons that uses actual bullets, not rockets or crossbow bolts.

Explosive Ammo creates an explosion on hit, and it can also stun players nearby.
Incendiary Ammo ignites nearby objects on hit.
Laser Sights increases your bullet accuracy by 60%, your weapon model must have at least 1 attachment to use this.
Ammo Pile gives you 10x mags of your current weapon, only supports a few ammo types.

Ammo boxes can only be used by four different players(I know none of you like this) four times, and Laser Sights can be used infinite times.
Lasers can increase your accuracy, but it can also expose your position, use them wisely.
Since the upgrades modify the bullet structure violently, some SWEPs may be bugged when upgraded.
Shotgun altfire only consume one upgraded buckshot, but some shotguns made with bases( such as TFA )
would consume everything in one shot, which I cannot fix.

Sorry about the broken English, I'm just too tired these days.