My KWA USP was perfectly working until today, it only shoots 4 rounds per fill. I thought the mag might leak at the first but I proved me wrong by putting it into water: no bubbles come out. It feels like the mag only takes little amount of gas in. What is wrong with it and how to fix it.
Thank you so much.
Edited by IsaacRoo, 31 December 2013 - 05:18 PM.