The 1970s frames come in two shapes, but these are independent of the caliber.
The early 29/70 frame copied the Swiss 06/29 design and was only found to be suitable for use in .30 luger versions. The 1973 variation is suitable for both 9mm and .30 luger. The ears were located about 1 mm further to the rear, this corrected reliability/feeding issues with several barrel lengths and the 'Swiss style' toggle ramp.
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