I bought a used 26" Benelli M2 then took it to Briley in Houston TX. I meet with Claudio Salassa and he told me what they offered as a 3 gun shotgun package and some extra's that were available. Here are the pictures of the results.
Cut 26" barrel down to 21", threaded for extended chokes to make OAL 22".
Lengthened forcing cones to help reduce recoil.
Briley fiber optic front sight.
TruGlo fiber optic rear sight.
Briley 2 pice bolt handle.
Briley extended bolt release.
Briley extended safety.
Opened and beveled loading port.
Extended carrier or lifter.
Briley magazine extension (8 round) and barrel clamp.
Ghost loading modification.
Lightened bolt.
Trigger job.
Action tuned.
Polished chamber throat.
3 Briley chokes.
I also saw examples of their 3 gun package on Winchester SX3's and Beretta Xtrema.
Thank you Claudio.
Total upgrade ~$1300
Total satisfaction - priceless
Went to test this fine shotgun and it liked everything I had on hand. The lightest I had was Winchester Xtra-Lite target load 1oz. 7 1/2 shot and Fiocchi 1oz. low recoil slug.