I just got it from another member and was told it's a Colt, but not sure. It is marked "MP".
No carrier, cam pin, firing pin, etc. Just the bolt with extractor and rings. It's in excellent condition. I just bought a complete carrier group, so don't need this one. $25 shipped (SOLD)
Colt "H" buffer in new condition. $40 shipped. (SOLD)
M4 preban stock only (no buffer, tube, spring, nut and plate), in new condition marked "J&T". $30 shipped.
Paypal preffered or MO.