That might interest user M2 Carbine, as well.
Oh my, am I in trouble.
I just bought 10 BD magazines for the SIG, giving me 13 plus a 15 rounder.
Saturday, 6 friends were taking turns shooting the SIG and loading magazines. I was the camera man.
Later my friend told me they went through 6-7 hundred rounds plus the 340 I already had loaded.
If I get 50 round magazines I'll cause a 22 ammo shortage in the local area again.