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Colt 1: raised C, AF (Accurate Forge pre Cerro acquisition in 2000). Colt proof marks at ejection port. Light purple. Period correct for pre-2007 builds. $365 Colt 2: raised C, cardinal forge. Colt proof mark at ejection port. M4 stamp at gas tube. Dark grey. Period correct for pre-2007. $315 Colt 3: C stamp, cerro forge keyhole. Colt proof mark at ejection port. M4 stamp at gas tube. Dark grey. Period correct for 2007-2017 builds. $235 Colt 4: C stamp, cerro forge keyhole. Colt proof mark at ejection port. M4 stamp at gas tube. Light purple grey. Period correct for 2007-2017 builds. $255
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