Flushmount Base Cups

Flushmount Base Cups
0 out of 5 based on 6 customer ratings
(6 customer reviews)


Sold individually.


Made from stainless steel and finished with a non-glare black oxide finish, these bases deliver exceptional strength and security.  They can be added to any synthetic or wood stock.


We carry both the 360 degree full rotation cups for any sling position as well as the 90 degree locking cups which help prevent against twisting of your sling.


6 reviews for Flushmount Base Cups

  1. 5 out of 5

    (verified owner):

    Best sockets for strong flush mount QD swivel sockets! Since it was a pain trying to find out what tools I needed to install, you’ll need a 1/2″ Forstner bit and a 9/16-18 UNF bottom tap. Also it’s best to use a Marine epoxy or similar resin on the threads for maximum strength.

  2. 5 out of 5

    (verified owner):

    Best flush cups I have every used. If you are familiar with using hand tools, this is a easy DIY. The threads make this much better over the no outside thread cups. Great price!

  3. 5 out of 5

    (verified owner):

    I have used non threaded cups in the past, to my sorrow and chagrin. They pulled out. With McMillan’s GrovTec threaded cups, I drilled a 1/2″ hole with a Freund Forstner drill bit, and threaded the hole with a 9/16-18 HSS Tap. I put steel Devcon epoxy past on the outside of the cup, and inside the hole. I used a hex head wrench to screw in the cups, and cleaned off any excess epoxy. These cups will never come out! Use Brownells Acra dye to get a good color match to your stock.

  4. 4 out of 5

    (verified owner):

    Quality counts.

  5. 5 out of 5

    (verified owner):

    Great for hunting with a sling, easy to remove for bench shooting.

  6. 5 out of 5

    (verified owner):

    Good, solid cups and easy installation. Used a Freud PB-0035 9/16-Inch precision forester bit to [hand] drill a 1/2″ deep hole on a A5 stock and a light coat of Devcon 62345 Epoxy to keep them together.

    – Use painters’ tape to cover surface you are drilling
    – ensure you are happy with where the cup and QD swivels will be (test with sling and make sure it does not interfere with bi-pod, etc.
    – tap a pilot hole and slowly drill
    – Butt stock is flat and hole came flash with cup (sanded slightly the corners so I can avoid future chips before epoxy was applied) . Bottom of fore-end is also flat
    – Side of fore-end part of A5 is curved and sanded lightly (and slightly) to bring hole surface to flash with cup (before epoxy was applied).
    – 20 minutes job (3 cups) and 24 hours cure for a solid and permanent attachment.

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