Hmac

i put one on my Urbino. Noveske also makes a QD socket that bolts up to the Nordic barrel clamp.

Here's the Noveske on mine, on the right side of the stock. Very secure. The other end of the sling plugs into a Noveske QD socket made to attach to the Nordic barrel clamp (Nordic makes one too). My slings (VCAS) all have sewn-in QD swivels.

I ordered a Nordic MXT +4 extension for my 18.5 Benelli M2, thinking that that would come pretty close to flush, at least with an extended choke tube. I then ordered a +2 extension cap from Shooters Source for those occasions I want to run 9 in the gun. That was $20. In retrospect, it would have more sense to have just ordered a second MXT Nordic extension to give me 9+1 for $34 so that I could install that for 3-gun.