Jodo tries the Frog Engineering Airsoft HPA Kit For the BCM Air MCMR gas blowback rifle... "Join me as I put my newly converted BCM GBB to the test with its HPA system! In this video, you'll see the HPA enhances the performance and reliability of this airsoft beast. From precise shots to an increased rate of fire, the difference is astounding. Watch the full gameplay to see the BCM GBB HPA in action on the field, and find out if this upgrade is worth it for your airsoft setup."