The Mako Pentagon Magazine Couple kit is the legal way to carry five 10 round magazines for a total capacity of 50 rounds in one package. Included in this kit is the magazine coupler and five 10 round Ultimag magazines.
Specifications and Features:
Mako Group PMC KIT
.223 Remington/5.56 NATO
Five 10 round Ultimag magazines
AR-15 pattern firearms and similar variants.