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The 7.62×51mm NATO (official NATO nomenclature 7.62 NATO) is a rimless bottlenecked rifle cartridge developed in the 1950s as a standard for small arms among NATO countries. It should not be confused with the similarly named Russian 7.62×54mmR cartridge, a slightly longer, rimmed cartridge.
It was introduced in U.S. service in the M14 rifle and M60 machine gun in the late 1950s. The M14 was superseded in U.S. service as the infantry adopted the 5.56×45mm NATO M16 rifle. However, the M14 and many other firearms that use the 7.62×51 round remain in service, especially in the case of various marksman/sniper rifles, medium machine guns such as the M240, and various rifles in use by special operations forces. The cartridge is used both by infantry and on mounted and crew-served weapons mounted to vehicles, aircraft and ships.
Although not identical, the 7.62×51mm NATO and the commercial .308 Winchester cartridges are similar enough that they can be loaded into rifles chambered for the other round, but the Winchester .308 cartridges are typically loaded to higher pressures than 7.62×51mm NATO cartridges. Even though the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) does not consider it unsafe to fire the commercial round in weapons chambered for the NATO round, there is significant discussion about compatible chamber and muzzle pressures between the two cartridges based on powder loads and wall thicknesses on the military vs. commercial rounds. While the debate goes both ways, the ATF recommends checking the stamping on the barrel; if unsure, one can consult the maker of the firearm.
Get started or finish your .308/7.62x51/6.5 Creedmor Build for Christmas! All NEW IN BOX.
(NOTE: I have a M5 Lower listed in the firearms section since it requires an FFL transfer. M5 Lower Receiver, Stripped. Forged 7075-T6 Aluminum. $190)
M5 Upper Receiver, Assembled, forged 7075-T6...
Comes with original box and papers, original 10 round magazine, additional Check Mate brand 10 round and 5 round magazines, tactical bag, Lula magazine loader.
Excellent condition. Only 45 rounds have been fired through it. It was broken in as follows: First 20 rounds, cleaned...
Receiver from the group buy about ten years on the "The Firing Line" forum
Cross posted on the web - first I'll take it unconditional owns it
Payment certified USPS money order or PP gift family friends no words
First I'll take posted - ships to FFL dealer only
Transfer paperwork required...