****ALL THE PART FILES HAVE BEEN UPLOADED THOUGH IT TOOK A WHILE..ENJOY!!!!!
The United States Army's Delta Force, at the request of R&D NCO Larry Vickers, collaborated with the German arms maker Heckler & Koch to develop the new carbine in the early 1990s.[when?] During development, Heckler & Koch capitalized on experience gained developing the Bundeswehr's Heckler & Koch G36 assault rifle, the U.S. Army's XM8 rifle project (canceled in 2005) and the modernization of the British Armed Forces SA80 small arms family.[citation needed] The project was originally called the HK M4, but this was changed in response to a trademark infringement suit filed by Colt Defense.
Delta Force replaced its M4s with the HK416 in 2004, after tests revealed that the piston operating system significantly reduces malfunctions while increasing the life of parts. The HK416 has been tested by the United States military and is in use with some law enforcement agencies and special operations units. It has also been adopted as the standard rifle of the Norwegian Armed Forces.
A modified variant underwent testing by the United States Marine Corps as the M27 Infantry Automatic Rifle. After the Marine Corps Operational Test & Evaluation Activity supervised a round of testing at MCAGCC Twentynine Palms, Fort McCoy, and Camp Shelby (for dust, cold-weather, and hot-weather conditions, respectively). As of March 2012, fielding of 452 IARs has been completed of 4,748 ordered. Five infantry battalions; 1st Light Armored Reconnaissance Battalion and 2nd Battalion, 4th Marines, out of Camp Pendleton, CA, First Battalion, 3rd Marines, out of Marine Corps Base HI, 1st Battalion, 9th Marines, out of Camp Lejeune, NC; and 1st Battalion, 25th Marines, out of Fort Devens, MA have deployed the weapon.The HK416 has an adjustable multi-position telescopic butt stock, offering six different lengths of pull. The shoulder pad can be either convex or concave and the stock features a storage space for maintenance accessories, spare electrical batteries or other small kit items.
The trigger pull is 34 N (7.6 lbf). The empty weight of a HK416 box magazine is 250 g (8.8 oz).
The HK416's barrel is cold hammer-forged with a 20,000-round service life and features a 6 grooves 178 mm (7 in) right hand twist. The cold hammer-forging process provides a stronger barrel for greater safety in case of an obstructed bore or for extended firing sessions. Modifications for an over-the-beach (OTB) capability such as drainage holes in the bolt carrier and buffer system are available to let the HK416 fire safely after being submerged in water.
