Rifle Scopes Which USO is this?

[Surffshr]

Seller couldn't tell me and I couldn't place it on USO's website. (I'm not bdding or the selling BTW just like the looks of it) Thank you.

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=184937750

 

[Lowlight]

Re: Which USO is this?

ST-10

 

[sr15match]

Re: Which USO is this?

She's an ST-10 w/EREK, ERGO, ARD, M40 style windage knob.

 

[Surffshr]

Re: Which USO is this?

Thank you.