After almost a year, I’ve finally completed my M3 build. Parts list is as follows:
Trijicon MRO, Benelli 7 round mag tube, Urbino stock, Esse 5 round shot shell carrier, TRex arms sling, Blue Alpha Gear sling clip, GG&G M2 pic rail, GG&G oversized bolt release button, and a Surefire micro scout light pro.
Since it is very difficult to source a proprietary light mount specifically made for the M3, I decided to fabricate my own using a GG&G M2 light mount. The details of this modification can be found here: