Lay the gun on its rib on a flat surface. Measure LOP horizontally from the triggers to the edge of the butt. Measure DAH from the surface of the table to the top of the butt at the plate or recoil pad. For chokes you need a bore gauge, but as a general rule of thumb, on a 12 gauge with full choke a dime will not go into the bores at the muzzle. If your gun is a 30" 12 gauge it is likely the chokes came from Meridan at F/F.
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