page_title: List of weapons of the United States Marine Corps
section_title: Automatic Rifles and Carbines
hierarchical_section_title: List of weapons of the United States Marine Corps / Active use / Automatic Rifles and Carbines
caption_attribution_description: English: Lance Cpl. Zachary A. Whitman familiarizes himself with the M27 infantry automatic rifle in preparation for the Australian Army Skill at Arms Meeting 2012. AASAM is a multilateral, multinational event allowing Marines to exchange skills tactics, techniques and procedures with members of the Australian Army, as well as other international militaries in friendly competition. Whitman is a marksman with the III Marine Expeditionary Force detachment.
context_page_description: This is a list of weapons used by the United States Marine Corps:
context_section_description: M16A2 - Mostly being replaced by M27 in infantry battalions.
  M16A4 - select fire. Safe, semi, burst. Mostly being replaced by M27 in infantry battalions.
  M27 Infantry Automatic Rifle - Support weapon based on the Heckler & Koch HK416 (itself a piston-driven M4) using a free-floating barrel.                        Initially issued as a replacement for the M249, in 2018 the decision was made to adopt the M27 as the standard USMC assault rifle in infantry battalions.
  MK18 Mod 1 - Modified M4 with 10.3-inch barrel. Used by MARSOC
  M4 Carbine - Mostly being replaced by M27 in infantry battalions.
  M4A1 Carbine - Mostly being replaced by M27 in infantry battalions.
  Mk 17 Mod 0 used by MARSOC
  Mk 16 Mod 0 used by MARSOC
caption: A U.S. Marine armed with an M27 IAR affixed with ACOG Squad Day Optic.
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