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Aside from the obvious differences, such as the collapsible buttstock and shorter barrel (14.5 inches vs. 20 inches), there are some more subtle ones. The M4 has a higher Front Sight Base to compensate for the shorter sight distance, the M4 uses a different buffer and buffer spring than the M16, the M4 has an indentation in the barrel to accommodate the M203 grenade launcher mount developed for the M4 (government law enforcement M4s typically have a barrel without this indentation), and the M4 has a longer set of feed ramps which also extend into the lower receiver itself.

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Q: What is unique about the m4 compared to m16 rifle?
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Which has a greater range m4 or m16?

The M16 assault rifle has a greater range than the M4 carbine as a result of its 20-inch barrel, compared with 14.5 for the M4. The M16 can hit an area target out to 800 meters while the M4 is effective to 600 meters.


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The M4 is the carbine version of the M16 (carbine means short barreled rifle). Search Wikipedia for M16 for more reading.


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