Quote:
Originally Posted by MajorD
Interesting read - with no upper side plate screw ( near rear sight) this I would think should be well into model marked era. I am thinking about buying a mod 10 no dash offered for sale locally which is a five screw and in reviewing my SCSW it looks like the first four or so years of mod 10 production would have been five screw guns so the one featured in this thread is an anomaly for sure
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The engineering change order to eliminate the upper sideplate screw (AKA Bug Screw) was issued in 1955, three years prior to the use of the Model xx designation. This is the timeline of the Model 10 changes until the trigger guard screw was also eliminated:
10-1 (1959): heavy barrel
10-2 (1961): change extractor rod thread for standard barrel
10-3 (1961): change extractor rod thread for heavy barrel, change front sight width from 1/10" to 1/8"
10-4 (1962): eliminate trigger-guard screw on standard barrel frame
10-5 (1962): change sight width from 1/10" to 1/8" for standard barrel
10-6 (1962): eliminate trigger-guard screw on heavy-barrel frame