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KP9 Stock Adapter: The 5.5 Mount That Opens the Rear
The best KP9 stock adapter in our lineup is the JMac SM-5.5. It is one 1.4 oz mount that replaces the factory rear at the 5.5mm folding interface and takes every JMac stock, where the 1913 route needs two parts. On the KP9 it fits with conditions, so confirm your rear uses the 5.5mm hinge pin before you order.
What does the SM-5.5 change on a KP9?
The SM-5.5 is machined from 7075-T6 aluminum with a Type 3 hardcoat and weighs 1.4 oz. It is a direct factory stock replacement with two height option
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Nov 3rd 2026 -