[sddso75]

The Remington 51 is notable as one of the very few firearms built in the United States, containing no screws at all.

Additional information on grips and backing plates (supersedes some of what I posted earlier):

Jack First Inc (1201 Turbine Dr, Rapid City SD 57703, 605-343-8481) does sell reproduction grip panel backing plates. Two retaining pins (aka "buttons") are furnished with each plate. Front-to-back backing plate dimensions follow those of original factory parts closely, but upper and lower edges often do not (irrelevant to grip retention). The keyhole cuts in the new-made backing plates are ragged compared to original parts, and will require fitting to work properly. In some cases, the hole for the smaller center locating pin is off center. Thickness of material is a couple thousandths shy of original.

Recently, an opportunity presented itself to examine another Remington 51, with serial in the PA50,000 range. Grip panels, backing plates, and buttons appeared identical to the example described earlier.

New made magazine catches ("magazine lock" in factory parlance), catch followers, and catch springs are available also. Fitting is required.