I’m using the scalarworks this year on a 20ga m2 with the groove in the receiver and it’s worked well on several birds. Mine has the trijicon sro
That said, after the season I’m going back to a FF3 on a Sumtoy mount. I actually like the simplicity and size of the FF3 over the Trijicon SRO which is also 2x+ the cost of the FF3