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枪炮世界：LWRC公司的AR式产品
陆战资源公司（LWRC）原名为Leitner-Wise步枪公司（简称LWS），该公司成立于1999年，在2006年1月被一个名叫Pat Bryan的陆军退役老兵买下并改组（改组前的公司缩写叫LWS，真是改朝换代了）。公司位于弗吉尼亚州的春田镇，以生产AR式武器为主。
LWRC M6，标准型是14.5"M6型，此外还有10.5"的M6 CQB型、16.1"的M6 R型
LWRC M6A1是采用导轨护木的型号，同样有14.5"标准M6A1型、10.5"的M6A1 CQB型和16.1"的M6A1 R型
The M6 is a series of carbines designed and manufactured by LWRC, based on the M4 carbine, with which it shares 80% of its parts. Like the HK416, it features a proprietary short-stroke self-regulating gas piston system and bolt carrier/carrier key design, which prevents trapped gases from contacting the bolt carrier or receiver of the weapon, which reduces the heating and carbon fouling of the internals; simplifies field maintenance, and improves reliability.
Standard length barrel is 16.1 in, with a 1/7 in twist (6 lands, right twist) barrel with a ferritic nitrocarburized surface conversion which covers the barrel, inside and out, as well as the piston components.
The Discovery Channel show Future Weapons featured the M6A2 and the M6A4. ~2500 fps (6.8mm SPC from a 14.7 in barrel)Cartridge 5.56x45mm NATO
6.8mm Remington SPCAction Rotating bolt, selective fire Rate of fire 700-900 rounds/min Muzzle velocity ~2800 ft/s (5.56mm from a 14.7 in barrel) Feed system STANAG-compliant magazine
Barrett magazine (6.8mm models)Sights Troy BUIS Flip-Up Iron Sights
Models
M6 and M6A1
The M6 is LWRC's most basic model. It is the most similar to the M4, but it still has the short-stroke gas piston system common to all LWRC's models. The M6A1 is also similar to the M4, but is designed to accept SOPMOD accessories similar to the M4A1 used by USSOCOM.
M6A2
The M6A2 is identified by LWRC as its "standard carbine" and has features that allow it to be used in multiple roles in addition to an assault weapon, such as an optional longer barrel allowing it to be used as a designated marksman rifle. It is a duty weapon of the United States Drug Enforcement Administration in a special configuration called the M6A2 D-DEA. It is also available without a stock as the M6A2-P Pistol.
M6A3
The M6A3 is designed specifically to be a designated marksman rifle. It features an adjustable gas system to allow the user to adapt the rifle to different conditions and is designed to accommodate optics such as scopes and reflex sights.
M6A4
The M6A4 is designed to fulfill the role of the squad automatic weapon. It was developed for the United States Marine Corps' Infantry Automatic Rifle program, which seeks to replace some M249s with a more maneuverable weapon. However, it was not accepted for final testing in favor of a Heckler & Koch HK416 variant.
It fires from a closed bolt during semi-automatic fire, and from an open bolt during automatic fire which is labeled as "OBA" for Open Bolt Automatic. While in OBA mode, the first round may be fired from a closed bolt (it will then lock back and subsequent shots will be from an open bolt until the operator manually closes the bolt again). Firing from an open bolt increases cooling and eliminates the potential for accidental discharges due to rounds "cooking off" in an overheated chamber. It also allows for a faster rate of fire. However an open bolt design means that the first round fired will have reduced accuracy when compared to a closed bolt design. This is due to the fact that when the trigger is pulled, the bolt slams forward under spring tension, stripping a round from the feeding device, chambering it, then firing it. This sequence of events shakes the firearm and takes longer than a closed bolt design to fire the first round (greater lock time). This also introduces extra potential points of failure in the ignition of the first round.
