This metal set pin fits all KM4 AEGs and helps secure the mechbox to the lower receiver. It appears on all KM4 diagrams as part 123.
KM4 Series Mechbox Set Pin (Part 123)
$3.00
This metal set pin fits all KM4 AEGs and helps secure the mechbox to the lower receiver. It appears on all KM4 diagrams as part 123.
