I just spoke with Shane at GG&G; he confirmed that this part will work on the Benelli M4. He stated that they assign it a different sku on the GG&G website because they sell a package that includes the M3 charging handle. The 1030 part number is the for the release button only, and is compatible with the M1, M2, M3 & M4 shotguns.
Yes just installed on my m4. Exact same length lever and everything looks identical
Right from GG&G
Fits: Benelli M1 Super 90, M2, M3, M3 Super 90, 1014/M4
Yes, they buy the original part from the factory and replace the small button with the rectangular pad. That’s why the pad is a little angled. There is an extra pin and spring in the package, I used the original ones.
Mike B.: That's interesting because when I purchased this item you OP had "M4" listed in title. No wonder there's a gap between the bolt release and the shotgun. I'll be calling OP tomorrow to return this.
No, this only fits the M1 SUPER 90, M2, AND M3.