If you plan on going with a 120 or over spring you should think about getting a deepfire titanium piston (cost more but should last a very long time). I was stripping the teeth on guarder pistons after 2000 rounds since they don’t fully mesh with the lower. I also found the stock ICS cylinder gave a better seal then the guarder and hurricane 1’s I tried. I also found that the stock air nozzle worked best-the others would double feed sometimes.
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