earlier ones were locked breech but they went to blowback ( Time frame of change?) I had one I bought new about 1983 or so. Soft enough that the slide lower rear was getting peened by the hammer during cycling. I stoned and radiused it and it appeared to stabilize. It was an iffy feeder with silvertips but I got one magazine to work reasonably. OK with hardball. I ended up selling it to a co-worker that thought he needed it.

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