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One of the most popular modern sporting rifle platforms is based on the M4/M16/AR15 series of rifles. These all have a NATO STANAG 4179 magazine well that accepts a double-stacked detachable box magazine into the action, providing rounds for the firearm. Most modern magazines are 30-rounders with some legacy 20 round and 40-round magazines out there. However, with this as the standard, there is a growing movement and availability of ultra-high-capacity magazines offering 50-100 rounds or more. They all offer an increase in ‘ready ammunition’ which ideal in extended range sessions or in a possible high-density threat incident. Having more ready rounds allows the shooter less exposure by eliminating or at least reducing the amount of time spent exchanging magazines in a tactical situation.

Let’s take a look at these.

From my column at Firearms Talk.com

(photo by Sure Fire)