Page 162 - FAT 105 4.17 MOODLE

SINGLE- OR DOUBLE-FEED

The third classifying feature of a magazine is
based on how the cartridges feed from the mag-
azine. There are two ways (based on design) for
a cartridge to be fed: single and double. Single-
feed magazines will feature a feed lip design
that relies on both lips to hold and align the top
cartridge in preparation for feeding. Both feed
lips make contact with the cartridge until it is
stripped by the bolt/slide from the center of the
magazine. The next round is pushed up into the
Figure 14: Various single-feed magazines. exact same position with both lips making con-
tact with the case. The single-feed design is em-
ployed by all single stack box magazines, some
double stack magazines, and by many other
magazine types including drum, helical, hori-
stack magazine. The casket design may be one of zontal, and all rotary and tubular magazines.
the most complex box magazine designs, which
Double-feed magazines will feature a feed lip
can be attributed to its additional follower(s),
design that relies on one lip to hold the top
springs, and divider. Like the double stack mag-
cartridge. When the cartridge is stripped by
azine, the casket design is strictly reserved for
the bolt/slide, the next cartridge rises up into
rimless and rebated rim cartridges. The major
the opposite lip. As the rounds are continu-
advantage to the casket design is its great capac-
ously fed, they will alternate between the two
ity. The major drawback is the complexity of the
sides. The double-feed design is employed by
design and that the increased amount of mov-
double stack box and some drum magazine de-
ing parts can cause more reliability issues than a
signs. The double-feed design creates a simpler
double or single stack design.
double stack magazine, but makes the design of

Figure 15: Various double-feed magazines.

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