I just purchased a second hand M4, and I love it, but I'm missing the roll pin for the M4 slide stock assembly. i.e that secures the pistol grip to the receiver. Where can I obtain a replacement? i.e part number, source.
Currently there's a sling mount that runs through that hole, but it knocks the heck out of my hand. So replacing it with the roll pin would rock.
Thanks in advance.