Public Enemy sent us this video showing the Magazine and Silencer from Angry Gun designed for the KSC/KWA/Umarex MP7 Gas Blowback SMG. The test gun is the KSC version and as you can see that in its default setting, the doesn't penetrate in the standard "Coke Can Test" with the attachment of the Angry Gun QD Silencer which has its own inner barrel and no need for removing the flash hider, the BB penetrated it.

The next demo is their magazine which feeds well into the MP7 GBB and it's also a high capacity one. You can check for these products at any online Hong Kong airsoft retailer when available.