A new trend amongst airsoft vendors is airsoft rebuild kits that have been designed to help replace the internals of your airsoft gun without buying a whole complete airsoft gun. Amped Airsoft show their AEG Rebuild Kits... "Matt and Legler talk about our AEG rebuild kits. The kits are an easy way to get the parts you'll need to completely change the internals of your guns. They're currently on sale via the website so make sure to check it out!"