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I bought the Wiser Precision Arca pro for my M3. You also have to purchase a pic rail section. Not cheap, but it is not built cheaply, either. https://www.wiserprecision.com/products/arca-swiss-picatinny-adapter

Thank you. That’s for sure, the gun is much less hold sensitive than pre backbone. The slip fit bushing that I made for the backbone through hole will allow for placement experimentation, assuming that the through holes are consistent. If not, it’s not a problem to make a new bushing.

This is a shot string using .218 33 grain Zan slugs. The new support has helped with the accuracy.

Thank you. It really helped with the 700mm flex. I first tried a 3d printed band. That did not marry the barrel as well as I had hoped. This concept appears to have moved the flex to the arca rail under the bottle.

M3 barrel support I made for use with the Airmarksman zero moa backbone.

Shout out to Tony. I received my M3 yesterday. Beautiful gun and exceptional service. Thank you , Tony Ron