Anyone here good at machining and making custom parts for guns or knows a local business that could? I have a TriStar Tec-12 (Convertible, SA/pump) shotgun, and I found the stock to be too long for me, along with the grip to be largely uncomfortable. I spoke with Tristar and they verified that the Tri-12 is based off the Benelli M3. I've searched around and only have found 1 person to have successfully converted a M3 to accept a AR-15 Pistol grip and stock. M4 stock adapter for Benelli M3 But it has been 4 years, I've attempted to contact this user with no luck. I was wondering if there is any hope for me and could be able to make something like this for me. I have a spare AR15 Grip and Stock, but not castle nut or buffer tube. Thank you in advance.