This is an excellent, original example of a late 1950s production, M1 Garand rifle chambered in the rare "experimental" Duplex cartridge of "22-06". After the Korean War the U.S. Army began to evaluate shorter, lighter and more lethal cartridges for the standard US infantry weapons. One of the concepts was the short lived development of a series of experimental cartridges that were intended to improve the hit probability by using hyper-velocity and multiple projectile cartridges based on the 30-06 and later 7.62 cartridges. The test rifles used at that time were the very late production M1 Garand rifle. This rare, like new rifle, is one of those test rifles intended to use/fire a duplex cartridge. The duplex 22-06 cartridge itself is actually a 30-06 case necked down with an elongated neck, that is loaded with two small 50 grain, 22 caliber conical shaped bullets (stacked on top of each other) in place of the standard 150gr ball cartridge. There was also a "triplex" cartridge that was of the same concept but it used three small bullets inside. These cartridges are shown and discussed on page 646 and 647 of Bruce Canfield new book, "The M1 Garand" Rifle. The intent being that a multiple projectile cartridge would increase your hit probability just like firing a shotgun cartridge. The rifle was manufactured by Springfield Armory in 1957 and as noted it has the very late serial number range. The receiver is marked with the standard four line Springfield Armory markings on the heal of the receiver over serial number "6088156". It is fitted with the correct and original .22 caliber barrel that is marked on the side: "SA 37999 5 57 8142 4233 RP CAL 22 DUPLEX". The bolt is marked "SA 65282871-SA/YO2", and the operating rod is marked "6535382 SA". The complete trigger group is all correct late post-war SA production and is correctly marked. It is fitted with the standard gas cylinder with a high hump gas cylinder lock and a four-slot gas plug marked "NHC". It is fitted with a standard front and rear sight set and a standard walnut stock and hand guard set. The stock has the DOD cartouche on the left side and a single circled "P" proof in the pistol grip area. The buttstock and foregrip area are both marked with a small stripe of "red" paint to alert the shooter that this rifle is chambered for a "non-standard" cartridge. This rare rifle comes with a green GI web sling, cleaning kit (inside buttstock) and one enbloc clip with eight rounds of triplex ammunition. The headstamp is "W.R.A. 7".

Excellent with 98% plus of the original parkerized finish overall with only minor action cycling wear. The stock and handguard set is in excellent plus condition with crisp original cartouches and proofs. Mechanically Excellent. An excellent example of an experimental M1 Garand in rare 22-06 duplex caliber.