I purchased this magazine for my Vorsk VMP1 AirTac HPA conversion - the magazine fits well- feels secure locked in place and disconnects easily. The magazine indicator on the side works wells giving a quick guide on the rounds remaining. The magazine feeds well, no issues with loading. The shorter length with the hpa adaptor in place means that the length is not much longer than the original magazine when in place- I didn’t want to dramatically change the dimensions of the completed gun. I’m pleased that the colour of the magazine is a very close match to the Vorsk tan colour.