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<blockquote data-quote="cowadle" data-source="post: 3925271" data-attributes="member: 7203"><p>From about 1974 to 1980 Universal Firearms accepted special orders from various government agencies, both here and abroad. Law enforcement, prisons, and others occasionally wished to purchase .30 caliber carbines with features different than Universals current production hybrid carbines. The features ordered varied with some of these contracts. The most common and visible feature was a slide absent the hole for the right bolt lug and having a slide stop pin to hold the slide back and bolt open. The receivers were machined with a deep hole for a single recoil spring and recoil spring guide. The outward appearance was a redux of the carbines Universal manufactured prior to their change to their hybrid design at s/n 100,000.</p><p>The redux carbines appear sporadically throughout the 300,000 serial number series. The lowest seen so far is s/n 308241. The highest has been s/n 398102.</p><p></p><p>The parts used depended on the particular contract. All observed so far have had the Universal Firearms aluminum rectangular trigger housing and trigger group. The slide is interchangeable with a GI slide. Some have the Universal bolt with the internal firing pin, some have a GI style bolt with a floating firing pin.</p><p></p><p>The floating firing pin in the GI style bolt required a cut in the receiver bridge below the rear of the closed bolt (see the 5th photo below). The cut restrained the forward movement of the firing pin until the bolt lugs rotated into the locked position. Redux carbines having a GI style bolt with a floating firing pin should have the receiver cut. Redux receivers having the Universal bolt with internal firing may or may not have this cut. A redux receiver that has the cut should be compatible with a surplus GI bolt group. However, before firing a redux carbine with a replacement bolt the carbine, barrel, and bolt should be inspected by a competent gunsmith to make sure the three will work together safely.</p><p></p><p></p><p>from the website i linked early. your carbine appears to be a universal single recoil spring REDUX version</p><p></p><p>[URL unfurl="true"]http://www.m1carbinesinc.com/carbine_universal4.html[/URL]</p></blockquote><p></p>
[QUOTE="cowadle, post: 3925271, member: 7203"] From about 1974 to 1980 Universal Firearms accepted special orders from various government agencies, both here and abroad. Law enforcement, prisons, and others occasionally wished to purchase .30 caliber carbines with features different than Universals current production hybrid carbines. The features ordered varied with some of these contracts. The most common and visible feature was a slide absent the hole for the right bolt lug and having a slide stop pin to hold the slide back and bolt open. The receivers were machined with a deep hole for a single recoil spring and recoil spring guide. The outward appearance was a redux of the carbines Universal manufactured prior to their change to their hybrid design at s/n 100,000. The redux carbines appear sporadically throughout the 300,000 serial number series. The lowest seen so far is s/n 308241. The highest has been s/n 398102. The parts used depended on the particular contract. All observed so far have had the Universal Firearms aluminum rectangular trigger housing and trigger group. The slide is interchangeable with a GI slide. Some have the Universal bolt with the internal firing pin, some have a GI style bolt with a floating firing pin. The floating firing pin in the GI style bolt required a cut in the receiver bridge below the rear of the closed bolt (see the 5th photo below). The cut restrained the forward movement of the firing pin until the bolt lugs rotated into the locked position. Redux carbines having a GI style bolt with a floating firing pin should have the receiver cut. Redux receivers having the Universal bolt with internal firing may or may not have this cut. A redux receiver that has the cut should be compatible with a surplus GI bolt group. However, before firing a redux carbine with a replacement bolt the carbine, barrel, and bolt should be inspected by a competent gunsmith to make sure the three will work together safely. from the website i linked early. your carbine appears to be a universal single recoil spring REDUX version [URL unfurl="true"]http://www.m1carbinesinc.com/carbine_universal4.html[/URL] [/QUOTE]
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