more sophisticated attachments (although this could be attributed simply to the change from a long-standing "tried and true" system to a new one). Complaints ranged from the forward grip and sighting system, the pistol grip handle catching on things, and the side loading mechanism. They even criticized its ability to act as a stand-alone launcher, a feature included in response to troops re-acquiring Vietnam-era M79 grenade launchers that supposedly gave better accuracy when fired from the shoulder than if slung under a rifle, although the collapsible stock is somewhat short for the task. The M320 has the ability to fire detached from a rifle. Soldiers have reported difficulties carrying it unmounted, as its one-point sling does not hold it securely. Carrying by the sling would cause it to bounce around and sometimes be dragged through dirt. Soldiers wanted to carry the M320 in a holster to provide protection, rather than just putting it in their rucksack. The Natick Soldier Systems Center began the M320GL Holster Soldier Enhancement Program (SEP) in November 2012. Three commercial vendors produced 167 holsters each. The SEP used the "buy-try-decide" concept, which allows the Army to test the functionality of equipment without spending much time on research and development. Soldiers from the 75th Ranger Regiment were given a dozen holsters and went through standardized tests in mid-May 2013, after which they filled out surveys. The next step was to test them with an entire brigade. As of July 2013, the holsters were being evaluated by soldiers in Afghanistan. Project officials were to make a recommendation to Fort Benning by the beginning of fiscal year 2014. Users <ref name="Heckler & Koch M320 GLM (HK AG36) 40mm Single-Shot Under-Barrel Grenade Launcher (UBGL) (2010)"/> :United States Army, United States Marine Corps and United States Air Force See also KAC Masterkey M26 Modular Accessory Shotgun System Rifle grenade Underslung Grenade Launcher Pike (munition) AMD-65 XM25 CDTE Related Lists: List of individual weapons of the U.S. Armed Forces List of crew served weapons of the US Armed Forces United States 40 mm grenades References External links XM320 40 mm Grenade Launcher Module (GLM) Fact sheet 2008 Heckler & Koch Military and LE brochure AG36 / AG-C / EGLM / XM320 grenade launcher page on Modern Firearms site M320 on GlobalSecurity.org XM320 page on HK USA site 40×46mm grenade launchers Grenade launchers of the United States Heckler & Koch grenade launchers Military