I recently flipped through the latest edition of APG and came across one of the many mail order ads. Within the ad it had upgrades for the mag. I was wondeing what the "phase 2" is. I know it replaces the back end of the mag reciever but what does it do? Also, what is the reactor valve? It replaces the on off valve and other than that I have no idea what it does. Are these upgrades approved by AGD?


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