Agreeing with MassiveAttack I wouldn't get too hung up on 3in shells. Choke constriction is more important if it's fixed. I pretty much exclusively use 2 3/4 inch shells with a quarter choke and do so with an amount of success.
If you comfortably shoot the A5 a new M2 will give further reduced recoil and a life time of trouble free service at a fair price. There are other inertia options worth considering- Mirocchi, Breda, Franchi. There are arguably softer shooting options available with varying degrees of reliability and often offered with complimentary sanitary pads and needed warranties. Most modern guns come with shim kits so you can adjust gun fit along with multiple choke options- and of course it will be shiny and new.
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