1972 Colt Ar-15 Sp1 - Page 2
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1972 Colt Ar-15 Sp1


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Old 11-29-2012, 12:40 PM   #11
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Try it for grouping, not sure. I would guess that would be at the upper limit for weight.
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Old 11-29-2012, 04:07 PM   #12
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Yes, I plan to keep it and it is a 1:12 twist on that barrel. I've read you need to use lighter grain bullets with that twist. Is a 55 grain to heavy for that twist? Or should it be lighter than that?
That weapon was specifically designed for the 55 grain M193 ball ammo.
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Old 11-30-2012, 01:30 AM   #13
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The barrel on this gun is marked C MP CHROME BORE and from everything I've read that means the chamber and barrel are both chromed. I've also read they'll handle .223 and 5.56 NATO, but the lower is stamped Cal .223 so not sure if I can trust that info.
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Old 11-30-2012, 03:59 PM   #14
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It is chromed in both chamber and bore. And you can use 5.56 in it.

BTW, is the receiver marked "Car-15" or "SP1?"

IIRC, by 1972 all of them were chrome lined, had 5.56 chambers and round hand guards.

The designation 5.56X 45mm was not in common usage outside of military circles back then, and 5.56 rifles were generally marked .223
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Old 11-30-2012, 04:02 PM   #15
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It is chromed in both chamber and bore. And you can use 5.56 in it.

BTW, is the receiver marked "Car-15?"
I don't remember seeing that, I'll check when I get a chance. What does it mean if it is?
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Old 11-30-2012, 08:09 PM   #16
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I don't remember seeing that, I'll check when I get a chance. What does it mean if it is?
Car-15 was the original designation for the carbine version of the AR15/M16 rifles.
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