Anyone know who's the manufacturer of this upper receiver?

[ChickanWangCharley]

Hello guys,

This part was donated to me with a bunch of other parts and I was told it was for an AR10. I'm curious who's the manufacturer. The only marking on it is a "X" stamped on the top of the receiver. 

 

Edited February 5, 2020 by ChickanWangCharley

[ChickanWangCharley]

On second thought... I will need this information because I will be attempting to build an AR10 with the donated parts. 

[Ravenworks]

Look for the forge marks for a start

[98Z5V]

Looks like a DPMS-based cut at the back of that receiver, so you're not going to be building any AR-10's with it.

[Robocop1051]

Definitely looks like a forging. I’m with 98 here, that’s not an AR-10. That’s an LR308 compatible upper. 

[mrraley]

I hate to be the barer of bad news, but that don't look like a .308 upper...

Edited February 6, 2020 by mrraley

[Matt.Cross]

47 minutes ago, mrraley said:

I hate to be the barer of bad news, but that don't look like a .308 upper...

I thought the same thing. The body of the upper is too narrow in proportion to the top rail.

[98Z5V]

3 hours ago, mrraley said:

I hate to be the barer of bad news, but that don't look like a .308 upper...

Truth.  It's AR15.

2 hours ago, Matt.Cross said:

I thought the same thing. The body of the upper is too narrow in proportion to the top rail.

AR15s have 13 pic slots in the upper, large-frames have 18 pic slots in the upper.  You can't change the Picatinny dimensions, they're fixed.

That's an AR15 upper. Probably from X-Products.  I'd check mine, but I painted it.

[ChickanWangCharley]

Thank you all! You've been awesome! No bad news here lol... It was all donated to me 🙂. I can't complain when I got them for free.