In the 1950s, the British developed the .280 British, an intermediate cartridge, and a select-fire bullpup assault rifle to fire it, the EM-2. They pressed for the U.S. to adopt it so it could become a NATO-standard round, but the U.S. insisted on retaining a full-power, .30 caliber round. This forced NATO to adopt the 7.62×51mm NATO round (which in reality is only slightly different ballistically from the .308 Winchester), to maintain commonality. The British eventually adopted the 7.62mm FN FAL, and the U.S. adopted the 7.62mm M14 rifle. These rifles are both what is known as "battle rifles" and were a few inches shorter than the standard-issue rifles they replaced (22" barrel as opposed to 24" for the M1 Garand), although they were still full-powered rifles, with selective fire capability. These can be compared to the even shorter, less-powerful assault rifle, which might be considered the "carbine branch of weapons development", although indeed, there are now carbine variants of many of the assault rifles which had themselves seemed quite small and light when adopted.