Help identify AR upper assembly

[ACGiddens]

I have been searching for a couple days now and cannot seem to find anything about this upper receiver i got from a friend for $300 complete.

I started an AR pistol build Last week and a friend of mine said he had an 11.5" piston driven upper that he was going to use for an SBR but never moved forward. He did not remember the brand. I got it from him yesterday and the only brand marking I've found is the Yankee Hill on the Gas block. What appears to be a serial number on the BCG, nothing on the charging handle. After searching I could not find that they had an 11.5" upper much less one with a piston system.

Obviously this could just be a Frankenstein upper but I was hoping someone might be able shed some light if I got a good deal at $300 or maybe not so much. I am new to AR's so any help is appreciated!

Thanks in advance and let me know if you would like to see more pictures.

 

[cooter]

It's almost impossible to tell who distributed or finish milled the upper receiver....but as for who cast it, the casting Mark identifies the forging company. Yours is a square casting Mark. Here is the list.
Forging marks/makers:

A (splintered) = Anchor Harvey Aluminum

AF = Alcoa Forge

C AF = Colt Alco Forge

C MB = Colt / Mueller Brass

Cardinal (stylized) = Cardinal Forge

CH = Colt Harvey Aluminum

CK = Colt / Kaiser Aluminum

Circle/Crooshairs w/"AR" = ArmaLite

CM = Colt / Martin Marietta

D (stylized) = Diemaco

DK = Diemaco / Kaiser Aluminum

E = Emco

EK = EMCO/Kaiser

E MB = EMCO/Mueller Brass

F keyhole = FNMI / Cerro Forge

FA = FNMI / Anchor Harvey

FK = FNMI / Kaiser Aluminum

FM = FN/Martin Marietta

FMB = FNMI / Mueller Brass

Keyhole = Cerro Forge

L = Lewis Machine & Tool

LK = LAR / Kaiser Aluminum

LM = LAR / Martin Marietta

M (under diamond) = Mueller Industries

PA = Capco / Anchor Harvey

PM = Capco / Martin Marietta

Square = BAFE

 

[nitrousfedlx]

Complete, I'm assuming bcg and ch so for $300 pretty good deal. Plus u got a nice Yankee hill railed gb.

 

[AWW34]

Pretty much what the poster aboveme said.

Also 300 for a complete AR upper is a pretty good deal. No matter the brand. And usually factory or drop in piston kits add value. So all in all I'd say you got a good deal.

 

[AWW34]

Also, any markings on the barrel? What are the markings on the BCG? Those are the important part of the rifle.

 

[nitrousfedlx]

Pretty much what the poster aboveme said.

Also 300 for a complete AR upper is a pretty good deal. No matter the brand. And usually factory or drop in piston kits add value. So all in all I'd say you got a good deal.

I was looking at that thinking it was a piston setup, I'm not familiar with them though because all my stuff is DI. Since confirmed that does add even more value OP.

 

[AWW34]

I was looking at that thinking it was a piston setup, I'm not familiar with them though because all my stuff is DI. Since confirmed that does add even more value OP.

Yeah I feel like I remember seeing piston kits for sale here for close to 300 bucks by themselves. So he may have hit a jackpot.

OP let us know any barrel and BCG markings.

 

[nitrousfedlx]

Yeah I feel like I remember seeing piston kits for sale here for close to 300 bucks by themselves. So he may have hit a jackpot.

OP let us know any barrel and BCG markings.

All I know about is Adam arms when it comes to pistons. Was thinking about the $300ish area too. So either way he did good seems like. Lol

 

[opps]

Yankee Hill front gas block, Osprey piston system (only fits under large handguards or rails, Bishop made the upper receiver forging.

 

[nitrousfedlx]

Yankee Hill front gas block, Osprey piston system (only fits under large handguards or rails, Bishop made the upper receiver forging.

Nice info!