Both are built well and should last a long time. I own both and they are good sidearms. I suggest getting the g18c since they have 88rd extended clips available. I still cant find ones for the USP without rigging the g18's to fit. I would also look into the Y&P line of non-blowback pistols, esp. the Mk23. The silencer that it comes with has an internal barrel extension so with green/red gas you could actually fire fps around 400+. The range and accuracy of the gun are also incredible. The silencer doesnt dampen anything, but the gun itself shoots very quie since it's a nbb. I owned this gun for a couple years before selling it and I miss it. It's perfect for a sniper. Pretty cheap too (50-60 I think).
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