Like the title says, I have a M261 conversion kit with 4 of the mag inserts for sale. I finally broke down and bought a dedicated .22LR upper, so I don't see myself using this any more. It has been 100% reliable and fun as hell. All 4 mag inserts have been tested for function.
$125 shipped gets it all. Postal MO preferred, PayPal accepted, but you get to pay the damn fee (makes it $130). **SOLD**