I own a 44US and a Mossburg 140-B. The 140 seems to be a sporting version of the 44US action.

One messy thing has lead to another, and I have ended up with just one magazine between the two rifles. The mag fits both rifles.Attachment 91042

When I look on-line to buy a mag, I see ones like I have for the 44US and I see similar mags with some sort of knob on the bottom of the mag.

My question: does anyone know the difference between the knobed and knob-free magazine? Do you think the magazine I have now likely came with the 44 or the 140?

Thanks,

Roy
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