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Tad, unfortunately Marlin does use mostly Micro-Groove rifled barrels (Including on this rifle). I would ask them directly which, if any models are available with "Standard Rifling" at 1-800-544-8892 or by email inquiry here : marlinfirearms.com/contact

all of the 30-30s use the micro grove barrels

yes this gun has the micro grove rifling from the marlin site "This hunting machine is chambered for 30-30 Win. and features a 20” Micro-Groove® barrel with adjustable rear sight and ramp with hood front sight. Plus, it comes with a factory mounted and boresighted 3-9x32mm scope. The walnut-finished hardwood stock and fore-end have cut checkering." link marlinfirearms.com/lever-action/model-336/model-336w-wscope