Watch Stupid Airsoft use the Tapp Airsoft HPA shotgun shell adapter for the UMAREX/VFC UMP45 airsoft rifle. He says this unique upgrade offers practical benefits: it lets the UMP45 use standard airsoft shotgun shells, which hold 30 rounds—more than the stock 25-round magazines—while being lighter and more compact. Connecting the adapter to an HPA (High-Pressure Air) tank also eliminates the green gas cooldown issue, ensuring more consistent performance, especially in cold weather.

The demonstration shows the adapter working reliably across semi-auto, burst, and full-auto firing modes at 100 PSI, proving its snappy response and reliable feeding.