As most owners of the NS522 know, extra magazines for these guns are very, very rare, and they are expensive once you do find them. On top of that, they don't work very well, especially after considerable usage. Some folks have inquired about making magazines to fit these guns, but I am of the opinion that it would be considerably easier to fashion the single shot adapter. The single shot adapter is even harder to find than the mags, so here are a few pictures of one, along with my hand-drawn diagram. The adapter is 1 3/4 inches tall (top to bottom), 1 5/32 inches long (front to back), 15/32 inches wide (side to side), and there is a slot in the front for the mag catch. This slot is 23/32 inches from the top (top of mag to upper edge of slot), 29/32 inches from the bottom (bottom of mag to lower edge of the slot); the slot itself is 3/32 inches tall (top to bottom), and it is 1/8 inches deep. The very top of the adapter is grooved to help a single loaded cartridge feed easier, and the groove tapers back to front (ie, it is wider at the back). I almost always shoot my 522s with the s/s adapter. [Note: in the diagram I've included, the "B" measurement is from the bottom of the mag to the center of the groove in the top. This is probably best seen in the third picture down. Also, as to the different views of the magazine, Pic 1 is from the left side of the mag; Pic 2 from the front; Pic 3 from the rear; and Pic 5 is from directly above the mag.]
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It's still inches and feet where I work in Canada even though I was one of the first generations to learn metric in school.....The influence of the US's stubborn refusal to change is felt in North America.
