SCAR? Va a ser que no...

"The IAR - Infantry Automatic Rifle program was originally initiated by US Marine Corps (USMC) in an apparent intent to replace aging M249 SAW light machine guns in their "automatic rifle" (squad automatic) role. USMC sought lighter and more maneuverable weapon, still capable of at least some sustained firepower. Original contenders included guns from FN, Colt and Heckler-Koch, as well as some other, lesser known names. After extensive trials in 2009 USMC finally selected the HK IAR rifle, which, in fact, is no more that heavy-barreled version of their HK 416 automatic carbine (assault rifle), and it hardly looks like adequate replacement for a dedicated squad automatic weapon with belt feed and quick-change barrel. By all accounts, it looks like USMC played the whole IAR trick to get the replacement for their M4 carbines without entering the political hassle and budgetary debates. In May 2010 the USMC representative officially anounced the adoption of the Heckler-Koch IAR as "M27 Infantry Automatic Rifle". It is not clear when HK will begin delivery of the M27 rifles, and how much rifles will be delivered to USMC."

it looks like USMC played the whole IAR trick to get the replacement for their M4 carbines

USMC’s HK M27 IAR (Infantry Automatic Rifle): U.S. Army Issues Sources Sought Notice Requesting Information for “Individual Carbine” Small Arms Technology: The Quest for the “Next Carbine” to Upgrade/Improve and/or Replace the Colt M4/M4A1 Carbine Continues…