I think the forearm may be too long to mount shell holder. If so, then I guess I won't have one. Does anyone know if I could even fit the 4 or 6 round saddle on the other side? The forearm definitely overlaps more than on my 590. And speaking of shellholders, do they just pin in with the trigger housing pin? Or does a gun need to be drilled or how do they work? I assume the tacstar and mesa tactical are the same...but I'm wanting the mesa tactical...