Magazine does not wind. Not sure what exactly is wrong with it. Would be good for parts or repair. Features Include: Flashmag design offers high speed ergonomic winding without additional power source Compact design doesn't alter weapon profile. Modular design allows for easy replacement of worn out components Constructed from lightweight and heavy-duty USA DuPont polymer material, exported to Taiwan specifically for molding these magazines Compatible with Firestorm mag adapters for various AEG platforms Optimized internal design provides consistent feeding and performance 1500+ rounds high capacity Ribbed body improves loading and unloading manipulations Check my page to see if there is anything else you need! I will accept reasonable offers I will combine shipping on multiple orders when possible