Angel Custom AP10 converts airsoft M16/M4 magazine well to accept airsoft MP5 magazines. The adapter works great with M4 airsoft electronic gun (AEG). But the Angel Custom AP10 does not hold the MP5 magazine in place on the APS Urban Assault Rifle (UAR). Although the UAR also uses M4 magazines, the mag well is too shallow to hold the MP5 magazine in place. This Airsoft3D bracket is designed for the UAR and the AP10 to provide a secure MP5 retention. This unique magazine bracket does not require any tools for installation. It is as simple as slipping the adapter onto the Angel Custom AP10, then inserting the AP10 into the UAR mag well. After that, you can insert and remove the MP5 magazine normally. The Angel Custom AP10 is available from Evike and Amazon: http://www.evike.com/products/46946/ http://www.amazon.com/gp/product/B00QKV1A1Q?ie=UTF8&tag=airsoftspecops-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=B00QKV1A1Q Airsoft equipment used for illustration of this UAR/AP10 Bracket are not included.