M855 has a green tip painted on the bullet.
M193 - BallM196 - TraceM199 - DummyM200 - Blank (Violet tip and 7 petal rose crimp)M855 - Ball (Green Tip)M856 - Tracer (Red Tip)M862 - Short Range Training Ammunition (Plastic with a Blue Tip)
By the manufacturer's headstamp (usually "LC" or "ADCOM") and the presence of the NATO headstamp (vs. the older M193, which did not have this).Additionally, there will be a green coloured ring around the projectile (although this may sometimes wear off over time).
M855 62 grain ball.
The cartridge most commonly used with the M4 is the 62 grain M855 or SS109.
Your Westernfield M855 was made by Mossberg for Montgomery Wards Dept. Store. Since it has no serial number it was made before 1968. No serial numbers were required on firearms before the 1968 Federal Gun Act.
You can expect the value of your firearm to be between 50-125 dollars depending on the overall condition of your westernfield.
As the M16 is not a sniping weapon, records of confirmed kills and distances generally are not kept. Special purpose variants of the M16 designed for designated marksmen and using the 77 grain Mk. 262 ammunition have been confirmed to have hit targets out to 700 metres (whereas 550 metres is the specified point target range for an M16 with standard 62 grain M855 ball ammo), but there is no record of whether or not kills have been confirmed at such ranges.
No way to answer. What type of steel? What range? What weapon is being fired? What barrel length? Armour piercing at 400 meters
The M16A2, M16A4, M4, M4A1, Diemaco C7 and C8, etc. have a 1 turn in 7 inches rifling twist. Although 1 turn in 9 inches is actually the ideal rifling twist for the 62 grain M855/SS109 NATO round, 1 in 7 was chosen because it can fire the 64 grain M856/L110 tracer with the same performance as it would the M855/SS109. It is also advantageous in that it can fire heavier cartridges, such as the 77 grain Mk 262 cartridge, which would be too heavy for a 1 in 9 barrel to stabilise.
The original M16 had a 20 inch barrel, whereas the M4 has a 14.5 inch barrel. The longer barrel of the M16 gave the round a higher velocity than the short barrel of the M4 does. However, according to military specs, the maximum effective range of the M4 against a point target is only 50 meters less than that of the M16, and the maximum effective range against an area target is unchanged. And I've just noticed you said M193 ammunition, and not SS109/M855. It should also be noted that the M16A1 and XM177 had a 1 in 12 inch twist rate, designed to stabilise the lighter 55 grain M193 cartridge, whereas the M16A2, M16A4, and M4 carbine have a 1 in 7 inch twist rate. Part of the reason for this change is rifling was to better stabilise the 62 grain SS109/M855 cartridge, although the specific twist was chosen for its ability to stabilise the 64 grain M856 cartridge, and can also be used with the 77 grain Mk 262 special ball cartridge. However, 1 in 7 is a bit fast of a rifling twist for the lightweight M193 cartridge. Although you can fire the M193 through a 1:7 barrel, the fast twist of rifling causes excessive spin with the lighter cartridge, which have the overall effect of reducing the round's stability and altering the terminal ballistics.
That depends on which 5.56 round you had in mind. The original M193 cartridge used a 55 grain projectile. The current M855 and SS109 NATO standard cartridges use a 62 grain projectile. The M196 tracer (which complimented the M193 ball cartridge) uses a 54 grain projectile. The M202 cartridge used a 58 grain projectile. The experimental XM287 and XM288 cartridges used a 68 grain projectile. The M856 tracer (which compliments the M855/SS109) uses a 64 grain projectile. The M995 armour piercing cartridge uses a 52 grain projectile. The Mk. 262 Mod. 0/1 cartridge uses a 77 grain projectile.
Depends on which military is using it. In the US military, the standard issue cartridge is the 5.56x45mm M855 cartridge. It is a 62 grain full metal jacket round. In NATO, the SS109 cartridge is standard, and this is also used by many non-NATO forces which maintain some degree of alignment with the West.