I believe you are referring to the pre-cut blocks of "material" that are inserted in the bottom of a 20 or 30 round magazine (below the spring and follower) limiting the magazine capacity to 10 rounds. If so, they are made by duraglock (a member on this forum from the Bay Area) and are available for a variety of mags (he has an ad in the "Firearm Parts and Accessories" Sale Forum).
Originally Posted by ViPER395
Give me a a case of .223 and immunity and i'll solve the gang problem from that News10 weather tower crap.
-talking about the Sacramento "gang tax" being proposed