A good airsoft gun, the Classic Army MP5 SD3 has been updated with the latest AEG tech from the Hong Kong-based airsoft manufacturer. But how does it fare as an HPA-powered one? Watch Tom's Airsoft Channel show one that uses the Wolverine Reaper Gen 2 HPA engine... "Hey guys, today in the video I can show you the Classic Army MP5 SD3 in the HPA version. As always, I wish you a lot of fun with the video :)"