alexpark7102 Posted March 2, 2017 Share Posted March 2, 2017 Right so I'm new to airsoft and i just bought a umarex UMP 45 elite which is shooting at what the website said is 360- 370 fps. I was wondering what spring it has in it at the moment and what spring I would need to bring it down to somewhere between 330-350, so that i can play at my local site Link to comment Share on other sites More sharing options...
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