It does not have the improved hammer drop safety feature. The 21655 stamping on the inner surface of the sideplate is an assembly matching number, not a SN. Does it match the assembly numbers inside the yoke area? It looks as though the rear grooved area of the front sight has somehow been attached to the original sight blade, maybe by silver soldering. 3.92" is close enough to 4".
Last edited by DWalt; 11-13-2016 at 08:02 PM.
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