If your 3 bad experiences with KSC guns had all used duster gas, then I can see why you would not like KSC guns. But if you used a higher gas than was intended for the USP, how can it be KSC's fault that you misused it? If one of your other two KSC guns broke under duster gas, then it would be KSC's fault, but not for this particular instance with the USP.
Anyways,
I've used 2 KWA G19's, 1 KSC G19, and 1 KWA M11 for 2 years, all with propane and have had zero problems so far.
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