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The direct impingement system is also the direct impingement system, making
heavily affected by ammunition and regular cleaning a habit.
maintenance. Because the system relies
Although the direct impingement system
directly on the amount of pressure that
may seem like it has a malignant flaw,
is generated by the cartridge, variances
the system has been employed success-
from round to round can affect the way
fully by one of the world’s most recog-
the system cycles. Underpowered or
nized firearms, the AR-15/M16. The di-
overpowered ammunition can cause the
rect impingement system was first used
system to malfunction.
in production with the MAS-49 rifle
Also, because the system relies directly on in the early 40s and into the late 70s by
the gasses from the cartridge, the whole the French army. In the late 50s, Eugene
system is exposed to carbon buildup and Stoner incorporated the direct impinge-
fouling from unburnt propellant. The gas ment system into the AR-10 and later
port, block, tube, carrier, bolt, receiver and into the M16/AR-15. Now, the direct
fire control group, and any other parts impingement system is used with huge
that are exposed internally where the gas numbers of AR-platform firearms from
is directed are all susceptible to this type many different manufacturers around
of fouling. Extra care must be taken with the world.
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