Please email us at techsales@opticsplanet.com regarding your question.
The Mesa Tactical Magazine Clamp might work for the Maverick 88 Security. However, the manufacturer only lists the Mossberg 930 and Remington 870 as being compatible.
The Mesa Tactical Magazine Clamp is about 2" in length.
The Mesa Tactical Magazine Clamps will not fit a Benelli M4 Shotgun. We do carry the GG&G Benelli M4 Sling and Flashlight Combo Mount. This mount provides 2 sling mounting points and 1 3/4" of picatinny rail. You can find the mount using the following link:
https://www.opticsplanet.com/gg-g-benelli-m4-sling-and-flashlight-combo-mount.html
They do not specify.
This has only been confirmed to fit the Mossberg 930 and Remington 870 as they have the same dimensions.
Yes, this will fit that shotgun.
It will fit a 930.
It is not compatible with the Shockwave, the product would not allow the slide to move fully forward.
Mark H.