It worked on my Girsan MC312
I have a Girsan MC312 that I got for a bargain at my local gunshop. It is basically a Benelli M2 clone. It is also primarily used for waterfowl hunting and it has a 3 1/2" chamber and set up for heavy loads. I Upland hunt for Dove and Quail. I was having trouble with it fully cycling the the upland ammo. A couple of different ammos were reliable, but not all of them. particularly the high speed steel upland ammo I like to use. I did a google search and found Taran Tactical Innovations site, and ordered on of their reduced power buffer springs. installation was super easy. I looked at a YouTube video. It now cycles all of the Upland ammo just fine. I saved the factory heavy spring in case I were to ever go waterfowl hunting, although I doubt I would ever need 3 1/2" rounds to take anything down. Pro Tip: Use a small Allen key or a small screwdriver in the hole in the buffer spring housing to help captivate the spring so the spacer on the end of the spring won't go flying, for removal and replacement. Don't ask me how I know.