The Airsoft CamMan brings his old G&G MP5 AEG back into action by installing the PolarStar Airsoft Jack HPA Engine... "My old G&G MP5 has been gathering dust for a while now. So I decided to give it a new lease of life by installing a Polarstar Jack.

I am a total noob when it comes to installing HPA. This is the first ever HPA Airsoft install I have ever done, so installing the Polarstar Jack into my G&G MP5 was being done as trial and error."