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The Rogers Super-Stoc allows changing the stock length to one of four positions and the stock can also be easily removed. The safety selector is reversible and particularly appreciated are the three supplied seven inch long composite snap on rail covers, as handling abruptly cornered rails with your bare hands can sometimes be unpleasant. The LE6940P has a chrome lined, six groove barrel rifled 1 in 7″ twist, with a barrel length of 16.1″. When doing this, the gas is carried into the rifle’s action, causing the action to foul earlier than it will with the PIS.)Īlso, while some discussion is made of the relative accuracy of the DGI in an AR over the PIS, I see both systems being more than adequate for most purposes. (The DGI in the AR design directs the gas through a tube to operate the bolt. With the Colt articulating link system used here – a variant of the PIS – the gases vent off through a port near the barrel muzzle which allows the action to stay cleaner longer compared to the DGI system.
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The piston rod then impinges on the bolt to cycle the action. Space here prohibits a lengthy evaluation of the piston impingement system of operation used by the Colt LE6940P, where gas formed from discharging a cartridge moves a piston and a piston rod. The rifle weighs 7.35 pounds (unloaded) the overall length is 35.5″ with the buttstock fully extended and 32.0″ when the buttstock is collapsed. The buttstock is collapsible to provide a better fit for various body sizes and the presence of bulky clothing. The fourth rail, at six o’clock, is removable to give access for further cleaning of the rifle, if need be.
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It features a monolithic upper receiver which has a MIL-STD-1913 (Picatinny) rail at the 12, 3 and 9 o’clock positions. Paraphrasing the Colt instruction manual, the Model LE6940P (“P” for piston) reviewed here is an Advanced Piston operated rifle. Choosing either system from Colt Firearms is a safe bet – with Colt being the only producer for decades of the DGI operated M16 in numerous configurations, along with the historic success of Colt’s piston system. The Colt LE6940 rifle (LE for Law Enforcement) has some of the most wanted modifications, including a choice of operating systems, as it can be had in either the original Direct Gas Impingement (DGI) system or Colt’s Piston Impingement System (PIS) which is a variation of a long established and well tested operating system in military rifles – the AK being the most proven of all. In military use, it has undergone, and continues to undergo, refinements as dictated by battlefield experiences. In its original configuration as the M16 with semi- and full-auto capability, it is now the longest serving rifle in our armed forces. The Modern Sporting Rifle (MSR), as the AR-15 semiautomatic rifle is now identified, is the most popular rifle in the United States.