Rendered useless if removed and replaced using punches other than those designed specifically for roll pins. While the roll pin (tension pin) is a very secure method of holding the front sight in place, roll pins can become deformed and/or Of this Front Sight placement is it interferes with the use of front sight removal tools. This makes these barrels easy to identify as barrels having been used by Plainfield Machine, their predecessors Millville Ordnance and H&S, and their buyer, Iver Johnson's Arms. Unlike their GI counterparts, the front sights used by Plainfield Machine followed by Iver Johnson's Arms in New Jersey were mounted at the rear of the turned down area on the front of the barrel that was designed This is the design used throughout production for all front sights used during the production of the M1 and M2 Carbines manufactured during WWII. They were held in place using a keyed slot in the barrel, a cut for the upper half of the key in the front sight, and a roll pin (tension pin) to secure theįront Sight to the key and barrel. Two piece barrel design with rounded section of barrel lengthened and inserted into rear half all the way to the breach.Ī few of the Gas Piston Housings swaged in place were also pinned in place to secure them.Įxamination of the breach reveals the rounded barrel inserted inside the outer rear half of the barrel.įront Sights were milled steel throughout production. This swaged gas piston cylinder was a variation of that used on many M1 Carbine barrels manufactured during and after WWII for the GI carbines. The gas piston housing and into the barrel. The gas piston housing was a separate piece that was swaged (compressed) into place with the gas hole then drilled through the bottom of The rounded forend extended into the rear half of the barrelĪnd all the way to the breach. The rear half of the barrel was machined separate from the rounded forend. The barrel was changed to 4 lands and grooves. Gas Piston Housing inset into barrel and brazed in placeįour 45 degree angle cuts leading to the reduction in barrel dimensions to the round barrel forend.Īt some point after the company was moved to Jacksonville, AR the design of the barrel was changed. The barrel area forward of the gas piston housing where the barrel dimensions were reduced to the rounded forend had four distinct 45 degree corners. The gas piston housing was inset into the bottom of the barrel and brazed in place. The barrels initially use by Iver Johnson in New Jersey, were a continuation of those used by Plainfield Machine in the 1970's. The parts used by Iver Johnson's Arms are presented within their respective groups as opposed to alphabetically. The parts for the Enforcer pistols and 9mm Carbines that are not interchangeable with other carbine parts are addressed on the pages devoted to those models. Sources for parts may be found on the Links page of this website. If you need a replacement part it does not need to have been made by Iver Johnson. With a few exceptions on their Enforcer pistols and 9mm Carbines, all of the parts used by Iver Johnson's Arms on their carbines are 100% interchangeable with surplus GI carbine parts and after market parts made to The information provided here is for historical interests only. This website is not affiliated in any manner whatsoever with Iver Johnson's Arms or any other carbine or part manufacturer. The design of many semi-automatic rifles, M1 Carbines included, warrants it. M1 Carbines purchased as a used gun, regardless of who made it, should be safety inspected by a competent gunsmith before firing. The failure of a part on a used gun manufactured between 19 cannot be directly attributed to the original manufacturer. Post WWII Commercially Manufactured M1 Carbines (U.S.A.)Įvery part on every gun has a lifespan.
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