Thermold AR-15 223 Magazines are tough and reliable in the field. The best thing about these magazines is the ability to resist dirt build-up and resists heat. Constructed out of nylon for great durability in the field to forgive a costly mistake like dropping it out of a stand. These non-corrosive and self lubricating magazines will keep feeding your rifle through the heat, cold, rain, or snow. The heavy duty construction does not have any exposed screws or springs.
The 20 and 30 round magazines have a very similar construction. The differences are mainly capacity and springs. Designed for 223 Remington or 5.56 NATO.