I got bored today and fitted my CO2 SIG P320 into my CAA MCK P320 Chassis... I did have to remove the safety and the rear sight (both are easily replaced). It fitted with just the safety removed but did not cycle reliably until I removed the rear sight. I had bought the CAA MCK for my real P320 and couldn't help but notice the CO2 P320 was very close in external dimensions to the original.
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