How faithful is the airsoft version of the Walther PPQ pistol to the real deal? Deranged Airsoft does a comparison... "Comparison of the airsoft PPQ and the real Walther PPQ.  How close are the two and could the airsoft version be viable for training purposes."

If you wan to add other stock-styles to your airsoft MP5K, here is a stock adapter made by Deranged Airsoft which you can order via 3D Print on Demand... "Here is a look at the Deranged mp5k stock adapter. It allows you to attach the PTS Masada stock. You can find this in the Deranged Designs store on Shapeways.com."

Deranged Airsoft developed a Tournament Lock for HPA regulators that can be used by event organisers to prevent adjusting beyond event/game regulations of HPA-powered airsoft guns... "This tournament lock will work with the Ninja LPR and Redline Firebase regulators. These two regulators are commonly used to power Polarstar Fusion Engine airsoft guns and Wolverine SMP airsoft guns.