Full Tune Up kits offer everything you need to upgrade your AEG. Expert set offers M130 spring upgrade with all related parts. If you are not experienced in working with AEGs, we recommend you allow us to perform upgrade work by selecting your desired power level upon buying an AEG from us. Works best in any long barrel AR15 style M16 AEG.
Installation of this item require deep experience on AEG gearboxes. If you have never performed an AEG upgrade yourself, consider having us do it for you properly to risk damaging your AEG.