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Grab a couple more Remington R51 magazines because those 7 rounds go fast. Slap in an extra magazine, rack the smooth and light slide back and you're back in business.
This is a factory Remington R51 7 round magazine that will fit your R51 perfectly.
They're all steel construction and are built to last as long as your R51 is which will be several family generations...just like the original Remington model 51.