Good afternoon. I recently purchased a Colt SP1 (R6000), which based off of the serial number dates to 1975. What concerns me is that the barrel markings read "MP CHROME BORE". My understanding and research tells me that there should always be a 'C' marking on Colt rifles. It is common knowledge that Colt just used whatever parts they had available (including Govt. contract parts) and I cannot find any conclusive info on the inter-webs, so I am hoping that some of you Colt experts can set me straight on the matter. Somewhere I was reading that there is sometimes a marking on the barrel between the FSP clamps, but I see nothing there either. My fear is that this rifle was re-barreled at some point or the upper is not Colt. Your expertise is appreciated.
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