By popular demand, we now have a Mil-Std 1913 Picatinny Rail Kit to attach to the Elzetta ZSM Shotgun Flashlight Mount. This is a great way to mount a laser or other accessory. Made from Type III Hard Anodized 6061-T6 Aluminum, the Rail Kit sells for $18.95 and is available now. Like everything we sell, it is Made in the USA.

Doesn't look like the Elzetta mount will work on a Benelli m4 anyways, due to the m4's tapered barrel. I have all but given up in searching for a simple light mount for my m4.

I understand your position and respect it.
I also agree with you on LaRue. They refunded my money on the mount I destroyed on my M4S90. I called them before I bought it, described in detail the M4's axially relieved type rail. They said it would be fine. It wasn't. I called and informed them that I had indeed destroyed the mount. They said "The M4S90's rail isn't compatible with that mount". I reminded them of the conversation prior. They took it back, refunded my full purchase price promptly, and I have nothing bad to say about them. I continue to buy their products and be 100% satisfied with them.

I then, along with a friend, influenced a limited run of proper 1913 spec rails for the M4S90 to be made that would bolt up using existing screws/lock washers that came with the shotgun.

It was a lot of work, but the manufacturer cannot even keep the items in stock at this point, so apparently others agreed that it was a good idea.

However, this is not about the M4S90. It's about your mount. I use the M4S90's problematic design for the top rail only as an example of what axially relieved rails do on heavy recoiling weapons to LaRue mounts.

Is it possible that Elzetta could create a mount that was not axially relieved? I would think it would even be easier, but I am not a CNC operator.

The real proof will be in the pudding. If you get a lot of phone calls about shredded LaRue mounts, you have a problem. If you don't, forget about it and rock on! Elzetta (in my experience) is a great company, and run by people who I am happy to say have made an honest profit off of me in the past. I am only offering my experience as constructive criticism, intending no "stomp" or insult and hope it has been taken as such.

Thank-you for your contribution to the shooting community!

The proprietary design of the Elzetta ZSM is unlike other mounts. If you want to give it a try and don't like it, we will refund your money in full.

Given the design of the ZSM, there is no simple way to cite the measurement you seek. The Mount is not designed to come to a hard stop apart from the magazine tube & barrel.