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CCRN - Take the advice of TR and Air.177; get a carbine upper and DO NOT mess with changing the Colt upper. It preserves the value (why people fall all over themselves for a Colt, I'll never understand) and you avoid the potential pitfalls of a "frankengun". Besides, it can actually be cheaper (less expensive), especially if you use the Colt bolt assy with the new upper. FWIW - Peregrino
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