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Description

A view of the RA-57 SIRIPH (www.deviantart.com/andorianus/… ) with some of its receiver housing made invisible, so you can see what it looks like inside. It's mechanically similar to the Steyr ACR and, at that, similar to all gas-operated cased-telescoped-ammmunition rifles or concepts I know of, a sparse category in and of itself. Well, I guess the LSAT did a variation on this theme.

Upon firing gas is tapped and released directly onto the "bolt" carrier face (kind of a misnomer since it carries no bolt anymore, the chamber moves), pushing the carrier backwards. The cam groove is attached directly to the carrier. As the carrier slides backwards, the cam groove pushes the chamber down. When the carrier slides back even further, the back of the carrier pushes the ejector piston back, which doubles as a recoil spring. When retracted full, the entire assembly slides forward, the ejector piston pushes a round out of the magazine into the chamber, and a spent round is pushed forward and out of the gun by the face of the new round. Once back in battery and the trigger is pressed, a hammer strikes the chamber from below.

Mechanically simple, if unconventional. The light weight of the carrier should help with controlling recoil.

Description

A view of the RA-57 SIRIPH (www.deviantart.com/andorianus/… ) with some of its receiver housing made invisible, so you can see what it looks like inside. It's mechanically similar to the Steyr ACR and, at that, similar to all gas-operated cased-telescoped-ammmunition rifles or concepts I know of, a sparse category in and of itself. Well, I guess the LSAT did a variation on this theme.

Upon firing gas is tapped and released directly onto the "bolt" carrier face (kind of a misnomer since it carries no bolt anymore, the chamber moves), pushing the carrier backwards. The cam groove is attached directly to the carrier. As the carrier slides backwards, the cam groove pushes the chamber down. When the carrier slides back even further, the back of the carrier pushes the ejector piston back, which doubles as a recoil spring. When retracted full, the entire assembly slides forward, the ejector piston pushes a round out of the magazine into the chamber, and a spent round is pushed forward and out of the gun by the face of the new round. Once back in battery and the trigger is pressed, a hammer strikes the chamber from below.

Mechanically simple, if unconventional. The light weight of the carrier should help with controlling recoil.