follower 14 also rest on the floor plate 18 in the fully loaded configuration the bottom ammunition cartridge has been removed from fig8 and 9 to generally illustrate the relation between the features of the ammunition cartridges and the ammunition cartridge guide surfaces the magazine components other than the spring may be formed from a polymer material for example the housing may be formed from an injection molded polymer e g polyamide polyphthalamide ppa or poly aryl ether ketone pek preferably the housing may be formed from polyamide nylon 6 6 additionally the polymer matrix may include reinforcement fibers e g carbon fiber or glass fiber although polymer or reinforced polymer materials may be preferred for forming the magazine components other materials that are sufficiently strong and durable may be used for example the magazine components may be manufactured from aircraft quality aluminum titanium steel or other alloys also magazine components may be formed by over molding a second material over a base part for example an elastomer e g rubber may be over molded on to a component formed from carbon fiber reinforced polymer accordingly the fore grip and rear grip portions of the housing may be formed from rubber that is molded on top of a carbon fiber reinforced polymer material referring to fig3 the follower 14 may include one or more.