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The Range
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Question about older Bushmaster rifle
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<blockquote data-quote="CAR-AR-M16" data-source="post: 2668051" data-attributes="member: 204"><p>Well, you would have been correct at one time. The very early M16's only had the MP markings by the FSB and the C in a square Colt proof mark on the barrel breach.</p><p></p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_1968603upperassy15.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_601B22.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Starting in October 1967 and prior to serial number 800,000 Colt’s added chrome to the chamber. Chrome chamber barrels are identified by a C about an inch back from the muzzle.</p><p></p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_C.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>By 1969 and before serial number 1,750,XXX Colt's chrome chamber barrels were marked C MP C, and the proof markings and C were moved to the same spot.</p><p></p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_barrelCMPC.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Effective in December 1971 at about serial number 4,700,000 along with the chamber the bores were chromed, early ones were marked C MP B.</p><p></p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_barrelCMPB.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Starting in 1974 and after serial number 4,900,000 chrome bores were marked C MP CHROME BORE. This marking was used all the way until the end of M16A1 production.</p><p></p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_barrelCMPCHROMEBORE.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="CAR-AR-M16, post: 2668051, member: 204"] Well, you would have been correct at one time. The very early M16's only had the MP markings by the FSB and the C in a square Colt proof mark on the barrel breach. [IMG]https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_1968603upperassy15.jpg[/IMG] [IMG]https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_601B22.jpg[/IMG] Starting in October 1967 and prior to serial number 800,000 Colt’s added chrome to the chamber. Chrome chamber barrels are identified by a C about an inch back from the muzzle. [IMG]https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_C.jpg[/IMG] By 1969 and before serial number 1,750,XXX Colt's chrome chamber barrels were marked C MP C, and the proof markings and C were moved to the same spot. [IMG]https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_barrelCMPC.jpg[/IMG] Effective in December 1971 at about serial number 4,700,000 along with the chamber the bores were chromed, early ones were marked C MP B. [IMG]https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_barrelCMPB.jpg[/IMG] Starting in 1974 and after serial number 4,900,000 chrome bores were marked C MP CHROME BORE. This marking was used all the way until the end of M16A1 production. [IMG]https://www.okshooters.com/data/MetaMirrorCache/img.photobucket.com_albums_0603_Ekie12091941_variation_20guide_barrelCMPCHROMEBORE.jpg[/IMG] [/QUOTE]
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