Originally Posted by rex feral its 4.5mm steel bb's. Single stack co2 magazine. https://gunfire.com/en/products/kp-0...152217498.html The KP-11 is a direct copy of the TM Hi-cappa 5.1 4.5mm steel bb double stack co2 magazine https://gunfire.com/en/products/kp-1...152217500.html you can spend silly money on upgrading these things. Thanks Looks good.
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