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Gunsmithing Flush cups- What are they for?

Oneteam

Sergeant
Full Member
Minuteman
Nov 6, 2011
263
13
CT
I know this is a silly question, but I have searched and cannot find the answer.
What are flush cups used for?
 
Re: Flush cups- What are they for?

Just like Bohem said. They are basically a cylinder with a groove cut on the inside diameter. A sling swivel made to work with them has ball bearings that retract when you push a button, and extend into the groove when you let go of the button, locking the swivel into the flush cup.
 
Re: Flush cups- What are they for?

Great, thanks. I knew they were for an attachment of some sorts but I was looking at them on my McMillan stock and just couldn't see why they were there.