on the Smith and Wesson m4, it means military police, because its sold under thesmith and Wesson M&P line of guns
M4 is the carbine- shorter barrel
14.5 inches on the actual M4 rifle.
Yes. Principle differences between the M16 and M4 include: M16 has a 20 inch barrel while the M4 has 14.5 inch barrel, M16 has a fixed buttstock while the M4 has a retractable six-position buttstock. Virtually all M4s have a 20 millimeter accessory rail, while only M16s after the A3 variant have the rail. The M4 carbine also has a stepdown in the barrel to accommodate the M203 grenade launcher due to its thicker barrel profile. Performance-wise, the M4 is also less accurate at range due to its shorter barrel, but is easier to maneuver in cramped environments.
barrels do not fold. Some m4 models allow you to take the barrel out.
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.
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.
The M4 is basically a carbine version of the M16A2 rifle, and was developed both to reflect the development of the M16A2 over the previous M16A1, and to correct deficiencies which had been identified with the XM-177 (which was the carbine variant of the M16A1).General differences between the M4 and M16 include:M4 has a four position collapsible buttstock (vs. the fixed buttstock of the M16)The weight of the buffer is different in the M4 than the M16The M4 has shorter handguardsThe M4 has a shorter gas systemThe M4 has extended feed ramps cut into the upper receiver for ease of chambering rounds.The M4 has a 14.5 inch barrel, vs. the 20 inch barrel of the M16The M4 has an "F" marked front sight base, which is designed to compensate for the difference in sight radius between the M4 and M16The M4 has an indentation in the barrel profile to facilitate the mounting of an M203 grenade launcher.Some people often cite the removable carry handle of the M4 as one difference, but the first production run of M4 carbines had the same fixed carry handle as the M16A2 (I was actually issued one when I was in the FL National Guard).
Most airsoft AUG inner barrels, are equivalent to an m4's inner barrel due to the bullpup design.
Yes it does, unless your barrel is stamped .223 .
That depends on which range you mean. Since they both use the same ammo the maximum range is the same 3600 meters. However the effictive ranges are different due to the barrel length difference: The M16A2 max range for a point target is 550m, the M4 is 500m. The M16A2 max range for a area target is 800m, the M4 is 600m.
The "k" in MP5k stands for Kurz, which in German means short. The MP5K has a shorter barrel.
The plain 16" cold hammer forged barrel with the M4 profile retails for $269 on their website, and the 14.5 inch barrel with FSB goes for $309. Keep in mind that if you get the 14.5 inch, you'll have to either get a flash suppressor permanently pinned (such as the Yankee Hill Phantom Comp series, which brings it to the legal 16"), or else get a Class II permit for an SBR. 14.5 inches is the actual length of the government spec M4, but most civilian "m-foregeries" come with a 16" barrel.