I ordered a stripped A1 upper and am going to get a dissipator upper and remove the barrel and transfer it to the A1. The whole A4 upper is around $200. Lowers are super cheap nowadays also.
My surplus store up the street has stocks and triangle hand guards. I want to build the Vietnam era dissipator with the modern reliable gas system.
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Eeewwww, don't touch it! Here, poke at it with this stick.
Posts: 34365 | Location: North, GA | Registered: October 09, 2002
Hey Mars, I'm looking at buying one right now and like yours the BC has the grooves for the assist but obviously there is not one. Would this mean the BCG has been replaced at some point? It's not a big deal to me but I just want to pay accordingly...
Posts: 447 | Location: Virginia | Registered: October 10, 2012
Depends on the age and type (rifle or carbine) of the SP1 you're looking at.
Early SP1 rifles had slick-side BCGs, and then later production SP1 rifles had serrated BCGs (starting in roughly the late 1960s/early 1970s).
By the time the SP1 carbines were being produced beginning in 1977, Colt had long since transitioned to using the serrated BCGs, so they should all have those.
I'm envious. The temptation to SBR that would be too strong for the to resist however. Then I'd have to find ANOTHER SP1 upper to keep around so I could switch back and forth. Vicious cycle.
True story. Chopping a SP1 is a no go. That just leaves me hunting a period correct CAR-15 upper with moderator. Far safer if I just lust over his rifle from afar. My wife has learned the price of such things. Dangerous times.
Originally posted by parabellum: Cutting chrome-lined barrels is problematic. This is not even taking into account the collectibility of that rifle.
I agree that the rifle's value would be compromised by cutting down the barrel, and thus a second barrel & upper is a better option.
My local 'smith has cut chrome-lined barrels. If done carefully, he said it isn't a big issue. The challenge is keeping the chrome from flaking at the cut & crown, as this could reduce accuracy. However, with a grin he stated that anyone using a chrome-lined barrel doesn't place accuracy as their primary barrel consideration.
Posts: 7984 | Location: Colorado | Registered: January 26, 2008