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Old January 14th, 2010, 19:38   #5
Crunchmeister
 
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Join Date: Nov 2007
Location: In your bedroom going though your underwear drawer
They're TM compatible, so fully upgradeable inside and out. Some aftermarket parts are a little proprietary and won't necessarily fit all guns, but for the most part, you shoudl be able to use pretty much 95% of what's on the market, including any non-ICS metal receiver.
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