Originally Posted by
Renegade04
As I said before, there is no SP1 carbine that would be suitable for a XM177 project other than the early XM177 as they had slickside uppers and 10" barrels. Even in this case, I would not alter a SP1 carbine regardless of its condition if it was all original. I would, however, replace the existing barrel with a 10" A1 profile (pencil profile .625") barrel and save the original barrel. Other than this, I would undertake an XM177 project from a different route. Remember, Colt is just a name brand and nothing more. If you want the Colt rollmarks, start with an 80% lower, have it engraved with the correct rollmarks, mill it out, and have it anodized. You can acquire either a 604 or 603 upper receiver from Nodak Spud and have the NDS rollmark removed when ordering. You can then use the correct profile and length barrel of your choosing.
I'm not worried about exact configurations and if I ended up with something like an "early model" XM177 it wouldn't kill me. I don't have the capacity to do a 80% lower let alone reproduce Colt markings. If I did start with an SP1, what barrel would you recommend? I've never really done a vintage build, I basically just want a decent quality mil spec barrel.
Last edited by SteyrAUG; 08-16-17 at 20:59.
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