G.T.,
Thanks so much! Very interesting to learn the Mec-Gar mags are made slightly undersized. Which kinda jibes with the OEM 29/70 magazine not fitting well within my 1939 P08—could only be inserted about halfway. At least I think that was the combination. Currently on a business trip, will verify after I get home tomorrow afternoon.
I did buy a new magazine catch spring. Temporarily installed in the Swiss Model 1929 and Mauser Model 29/70. No difference, can eliminate that as a potential cause.
What do you think about the difference in the upper left corner of the magazine catch hole, Mauser Original Model 29/70 vs. Mec-Gar, as shown in the post above? The magazine catch hole on my Swiss magazines match the Mauser Original 29/70.
In my mind, the extra material (“radius”) on the Swiss Model 1929 and Mauser Original 29/70 magazine is providing just enough “catchy-stoppy”—as compared to the Mec-Gar magazine—to keep the magazines engaged. Or, is the extra material (“radius”) a red herring?
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