I have a new ag composites carbon fiber stock which I really like, but it has sling studs in the front and back. Is there a way to convert them to flush cups, or add flush cups in a different location?
Short answer- no. Flush cups install in a much bigger hole than sling swivels. Now you could remove your sling swivels and install flush cups in the same location. Look at this thread for how to install flush cups:
A grovetec flush cup (and there’s really no reason to use anything else) takes a 1/2” diameter hole that’s 1/2” deep, flat bottomed (Forstner bit), that’s then tapped 9/16-18 UNF.
Which stock did you get? I recently got and have been fiddling with an adjustable Chalk Branch.
If you're concerned about hogging out a hole then there are options for flushcups. "Heavy Duty" flushcups are probably what you're after, but they make a "standard," smaller version too which will probably remove less material on the stock.
The HD flush cups have an option that is not threaded on the OD (No. GTHM234) which requires only a 1/2" hole to be drilled, not threaded, and is secured with a separate screw in the bottom. This is likely the least invasive option for replacing the existing studs in your CF stock so long as the screw has something besides foam to grip.
FWIW, the depth of the holes drilled for the threaded HD cups can be reduced to about ~.375" if the cup is likewise shortened to that length.
Cutting into the CF shell on the side, all bets are off. Of course, a call to AG Composites wouldn't hurt, they know what the internal cosntruction of their product is and whether or not it's appropriate to be drilling holes in it.
A grovetec flush cup (and there’s really no reason to use anything else) takes a 1/2” diameter hole that’s 1/2” deep, flat bottomed (Forstner bit), that’s then tapped 9/16-18 UNF.
Which stock did you get? I recently got and have been fiddling with an adjustable Chalk Branch.