Trojan Posted August 2, 2014 Posted August 2, 2014 I just bought this replacement pin for my ka m4: http://ant-supplies.co.uk/Pages/M4LockPins.aspx as my current front pin is very loose without the spring pushing it (was so little i lost it) but i just realized this front pin is very different. My stock one is 6mm diameter (rod) and 34mm long. img
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