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This new rear sight was also adjustable for windage. [9] At 100 yards (91 m), the M1 carbine can deliver groups between 3 and 5 in (76 and 127 mm), sufficient for its intended purpose as a close-range defensive weapon. The M1 carbine has a maximum effective range of 300 yards (270 m). However, bullet drop is significant past 200 yards (180 m). [23]
The M14 was developed to take the place of 4 different weapons systems: the M1 Garand, M1 carbine, M3 submachine gun, and M1918 Browning Automatic Rifle (BAR). [1] It was thought that in this manner the M14 could simplify the logistical requirements of the troops by limiting the types of ammunition and parts needed to be supplied. [ 2 ]
The third was Winchester's patent for the M1 carbine itself (“Automatic Firearm Construction” U.S. patent 2,308,257 published January 12, 1943) with Williams as the assignee. The fourth was the carbine's short-stroke gas piston (“Piston Means for Gas-Operated Firearms” U.S. patent 2,341,005 published February 8, 1944).
With tangent sights, the rear sight is often used to adjust the elevation, and the front the windage. The M16A2 later M16 series rifles have a dial adjustable range calibrated rear sight, and use an elevation adjustable front sight to "zero" the rifle at a given range. The rear sight is used for windage adjustment and to change the zero range.
Rear sight Forward assist Case deflector Caliber Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device 601: ArmaLite AR-15: A1 Triangular S-1-F A1 No No .223 REM 20 in. A1 1:14 (early) 1:12 (late) Yes Type 1 Duckbill Type 2 Duckbill 602: ArmaLite AR-15: A1 Triangular S-1-F A1 No No .223 REM 20 in. A1 1:12 Yes Type 2 Duckbill
The U.S. M1 carbine was more of a traditional carbine in that it was significantly shorter and lighter, with a 450.9 mm (17.75 in) barrel, than the M1 Garand rifle, and that it was intended for rear-area troops who could not be hindered with full-sized rifles but needed something more powerful and accurate than a Model 1911 pistol (although ...
Therefore, the M1 carbine is significantly less powerful than the M1 Garand. Another comparison is a .357 Magnum cartridge fired from an 18" rifle barrel, which has a muzzle velocity range from about 1,718–2,092 ft/s (524–638 m/s) with energies at 720–1,215 ft⋅lb f (976–1,647 J) for a 110 gr (7.1 g) bullet at the low end and a 125 gr ...
The design intended the recoil forces to travel, along with the mass of the weapon's moving parts, in a direct line to the shoulder of the gunner. While this design minimized muzzle climb, the sights had to be placed higher above the bore. A USMC paramarine Corporal firing a M1941 Johnson light machine gun in 1943