I am assuming this is all Colt, with full circle C's and MPC on Bolt. There are no markings on the carrier.
Came out of a SGW from the early 1980s. I shot 200 rounds with it in the last 30 days.
5 Photos below.
shipped USPS Priority. PayPal welcome. Please use email.
For now, I would like to sell all together. If a few days go by... I may change my mind and part out.