It just doesn’t make sense to me.
Now I love the Picatinny rail, but replacing a shotguns pump grip with a rail seems silly to me.
First I ask, what are you doing where you need all that rail space? Are there people mounting lights, lasers, VFGs, bipods, range finders, etc on their shotguns? I’m sure someone is doing that, but all the shotguns I’ve seen with tri-rail pump might have a light, or a vertical forward grip. But not much. Certainly not enough to warrant a tri-rail.
Now I haven’t used the Ergo rail that is pictured above. Nor have I used most of the tri-rails on the market. But I no know most cheap rail systems I have used have sharp edges. Part of the reason detractors of rails have often called them “cheese graters”. I can’t imagine that any of these rails are pleasant to hold under a shotguns recoil. But I may be wrong. I dunno. I just can’t imagine it.
It seems to me that a light on a shotgun would be better mounted to the barrel/mag tube.
That seems more practical to me. You are not having to rack the light each time you are pumping the action.
I’ve seen people use a vertical forward grip on a pump shotgun. I’ve fired a Keltec KSG with one. Felt awkward to me, but I’m not going to tell someone not to do it. I think that if you wanted a VFG on a shotgun pump, you could screw one right into the existing pump and not have to have all that aluminium rail. Or attach a small section of picatinny rail to the standard pump and attach the grip to that.
Do you really need more rail than that for a light?
Even this thing doesn’t have a tri-rail pump:
Do any of you use a tri-railed shotgun? How do you like it?