#OperatingRod

Hartford gunmaker Colt’s Manufacturing has introduced a new carbine model at the 2017 Bahrain International Defence Exhibition & Conference (BIDEC). The weapon, called the M5 Enhanced Carbine, is an AR-15-style rifle fitted with Geissele Super Modular Rail handguards sporting low profile screw mounting points, an ambidextrous lower receiver, and a short-stroke gas piston and operating rod gas system. The website Army Recognition has posted an article on the new carbine, as well as what appears to be a segment of a press release from Colt:

Today, a variant of the Heckler & Koch HK416 rifle is the standard squad infantry automatic rifle (IAR) of the United States Marine Corps, as the M27. At one time in the mid-2000s, though, companies from Colt to LWRC competed against each other in a competition to see which weapon would be the the Corps’ choice to fill the role, supplanting the belt-fed M249 as the squad’s automatic fire support capability. These weapons took a variety of approaches to meeting the USMC’s needs, from the constant recoil Ultimax MG, to the heat-sink equipped Colt IAR, to the open bolt full auto, closed bolt semiauto LWRC IAR. Ultimately, simplicity won out, and Heckler & Koch’s quite unambitious HK416-derived entry was selected to be the M27.

The redheaded stepchild of the SCAR contract was Robinson Arms’ XCR, an interesting design from a small company in Salt Lake City, UT. A rifle that is part AR-15, part FNC, and part noodle, the XCR represents an attractive looking and interesting might-have been, and now exists as a small player in a big market (although, as Ed knows, it’s big in Canada!).

Do piston guns handle heat better than DI guns? If so, why? If not what shortcomings do they have? The video from the popular YouTube channel IraqVeteran8888 embedded below doesn’t quite answer these questions, but it’s still very interesting:

The 2007 Dust Tests have come and gone. The IC Competition has completed. The M4 has remained the standard infantry rifle, and been upgraded to the heavy-barreled M4A1 standard. More upgrades are on the horizon, as part of the US Army’s effort to improve current infantry small arms. These “M4A1+” upgrades should indicate a certain level of satisfaction with the weapon – if the Army were unsatisfied, after all, surely they would divest themselves of the rifle entirely, rather than trying to improve it further.

Tagged with a name that reminds me of continuously variable automobile transmissions, Newtown Firearms of Siler City, North Carolina have announced an “infinitely adjustable” gas piston operating system: