CP bottle Regs are usually High Pressure, I`ve never seen a low CP Reg, I have 3 x since 2005 and all are high. there`s only a few guns out there that use low pressure , nearly all are high.
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A lot of manufacturers have kits available on the market to change the output pressure of there regs. Unless you know the full history of that reg, it will be hard to determine the exact pressure whether HP/MP/LP unless you have a gauge to test.