NEED HELP IDENTIFYING COLT UPPER

[taco_power]

I've had a colt upper reciever that ive gotten from a member several years back and im just trying to identify which model it is. Notable distinctions are as followed:
1. "C" stamp next to a sqaure stamp
2. "13629 M P 5.56 NATO 1/7"
3. 11.5" barrel with fixed front post sight that has "<B>1" forged into the front post
4. DOES have a bayonet lug

Any info is greatly appreciated, basically im trying to understand the value of what i have and whether or not i send it to the chopping block.
Thanks in advance!

 

[Spas-12 Owner]

6933.

Date on barrel?

 

[taco_power]

6933.

Date on barrel?

I dont see a visible date, any where in particular i should be looking

 

[Spas-12 Owner]

I dont see a visible date, any where in particular i should be looking

Behind the FSB, Under the handguards. However, some of the 11.5 and 10.3 I've seen only have a W stamped with no date

 

[opps]

A 6933 has M4 handguards from Colt. Cannot tell if that is a RAS from KAC - the bolt head looks different where is mounts into the Delta ring and I cannot see all the KAC patent info or roll pins normally present on the sides. May be third party - the picture from the top is not clear.
The muzzle device looks like a Dead Air and appears to be properly timed.

 

[taco_power]

A 6933 has M4 handguards from Colt. Cannot tell if that is a RAS from KAC - the bolt head looks different where is mounts into the Delta ring and I cannot see all the KAC patent info or roll pins normally present on the sides. May be third party - the picture from the top is not clear.
The muzzle device looks like a Dead Air and appears to be properly timed.

The kac hand guards and muzzle device were added by me. But the hand guard is a blem, some of the markings are double printed

 

[opps]

The old double printing trick. 🥸.
Nice upper. Probably run a H2 buffer with it. Have fun.