Mashburn Arms? There is an old school name for sure.Not the same. The one I think they are referring to is now called GunWorld over in the Del City area. That one USED to be Mashburn Arms before the purchase and move to Del City, and when they built that one, they did put in a range.
Don't go looking for GunWorld unless you just like giving away extra money.
Was another famed gun building outfit in OK, back in the day, but the name escapes me. Sedgewick?