This Colt heavy barrel came with an early Colt upper without the forward assist. A dealer at a gun show had three of these heavy barreled Colt uppers at a gunshow back around 1990, the cost was $200 each. I bought one and used a SP1 lower to test fire at 100 yards, it grouped just like an issue barrel, nothing special. The twist was 1 in 12.

Later I traded it to a friend but took these photos for later identificationAttachment 17485Attachment 17487Attachment 17486
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