How a Benelli M4 Shotgun Works | World of Guns | Operation and Field Strip
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Wikipedia: The Benelli M4 is
Wikipedia: The Benelli M4 is a semi-automatic shotgun produced by Italian firearm manufacturer Benelli Armi SpA, and the last of the "Benelli Super 90" series of semi-automatic shotguns. The M4 uses a proprietary action design called the "auto-regulating gas-operated" (ARGO) system, which was created specifically for the weapon. The weapon was designed in 1998, and was adopted by the armed forces of Italy, the United States, United Kingdom, among others, and has been used in a variety of conflicts, leading up to the present day.
On May 4, 1998, the United States Army's Armaments Research, Development and Engineering Center (ARDEC) at Picatinny Arsenal, New Jersey issued Solicitation #DAAE30-98-R-0401,[citation needed] requesting submissions for a new 12 gauge semi-automatic combat shotgun for the U.S. military. In response to the request, Benelli Armi SpA of Urbino, Italy designed and built the Benelli M4 Super 90 Combat Shotgun. On August 4, 1998, five samples of the M4 were delivered to Aberdeen Proving Ground, Maryland, and after intense testing, the M4 won the competition. In early 1999, ARDEC awarded the M1014 Joint Service Combat Shotgun contract to Heckler & Koch, U.S. subsidiary for importation of the Benelli M4 Combat Shotgun. The first units (count of 20,000) were delivered to the United States Marine Corps in 1999. During testing, the prototype was named XM1014, but after adoption, the "X" was dropped, and the weapon was officially designated the M1014.[2]
The M4 was the first gas-operated shotgun produced by Benelli. Its function is designed around an entirely new design called the "auto-regulating gas-operated" (ARGO) system. The short-stroke design uses two self-cleaning stainless steel pistons located just ahead of the chamber to function opposite a rotating bolt, thereby eliminating the need for the complex mechanisms found on other gas-actuated automatics. The ARGO incorporates only four parts: two symmetrical fore-end shrouds containing two small steel pistons that push directly against the bolt.
Additionally, the weapon is self-regulating for use with shotshells of varying lengths and power levels. It can fire 2.75 in (70 mm) and 3 in (76 mm) shells of differing propellant loads without any operator adjustments and in any combination. Low-power rounds, such as less-lethal baton rounds, must be cycled manually.
The sights are military-style ghost ring and are adjustable in the field using only the rim of a shell. The MIL-STD-1913 Picatinny rail on top of the receiver allows use of both conventional optical sights and night-vision devices, while retaining use of the original iron sights.
The modular basis of the shotgun means many of its features can be reconfigured as needed. It allows a user to quickly exchange the various assembly groups (barrel, buttstock, forend, etc.) without the use of additional tools.
On May 4, 1998, the United States Army's Armaments Research, Development and Engineering Center (ARDEC) at Picatinny Arsenal, New Jersey issued Solicitation #DAAE30-98-R-0401,[citation needed] requesting submissions for a new 12 gauge semi-automatic combat shotgun for the U.S. military. In response to the request, Benelli Armi SpA of Urbino, Italy designed and built the Benelli M4 Super 90 Combat Shotgun. On August 4, 1998, five samples of the M4 were delivered to Aberdeen Proving Ground, Maryland, and after intense testing, the M4 won the competition. In early 1999, ARDEC awarded the M1014 Joint Service Combat Shotgun contract to Heckler & Koch, U.S. subsidiary for importation of the Benelli M4 Combat Shotgun. The first units (count of 20,000) were delivered to the United States Marine Corps in 1999. During testing, the prototype was named XM1014, but after adoption, the "X" was dropped, and the weapon was officially designated the M1014.[2]
The M4 was the first gas-operated shotgun produced by Benelli. Its function is designed around an entirely new design called the "auto-regulating gas-operated" (ARGO) system. The short-stroke design uses two self-cleaning stainless steel pistons located just ahead of the chamber to function opposite a rotating bolt, thereby eliminating the need for the complex mechanisms found on other gas-actuated automatics. The ARGO incorporates only four parts: two symmetrical fore-end shrouds containing two small steel pistons that push directly against the bolt.
Additionally, the weapon is self-regulating for use with shotshells of varying lengths and power levels. It can fire 2.75 in (70 mm) and 3 in (76 mm) shells of differing propellant loads without any operator adjustments and in any combination. Low-power rounds, such as less-lethal baton rounds, must be cycled manually.
The sights are military-style ghost ring and are adjustable in the field using only the rim of a shell. The MIL-STD-1913 Picatinny rail on top of the receiver allows use of both conventional optical sights and night-vision devices, while retaining use of the original iron sights.
The modular basis of the shotgun means many of its features can be reconfigured as needed. It allows a user to quickly exchange the various assembly groups (barrel, buttstock, forend, etc.) without the use of additional tools.
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