There was a member here selling these awhile back. The shaved mag catch was done so these mags could possibly work in Valmet rifles. You are lucky if some work in your 74..I had some and none would run in any of my 74 rifles..I had to sell them..
You could check the group buy forum..That is where the E. German 74 modified mags where sold.
there was also another member here who was doing a little welding/adding a litte more metal to the mag cacth tab to bring them back to their original state. You might try and do a search on the topic...
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