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Posted: 1/28/2006 10:46:01 PM EDT
I have a 1979 Colt SPI that has a 20 inch Barrel.
I want to put a newer A3 16 inch Upper on it.
Do I need to stick with Colt or will any of the top AR vendors work.
Anything to watch out for?

Comments or Suggestions are welcome.

Thanks,
J
Link Posted: 1/28/2006 10:59:31 PM EDT
You can buy any upper I believe.

I would suggest sticking with the known good brands: Colt, Bushmaster, RRA, STAG, Armalite, etc.

If it were me I'd buy the upper of your choice and then buy another lower when I had the cash. 2 guns is better than 1.
Link Posted: 1/28/2006 11:24:15 PM EDT
I would love to buy a new rifle, but the only problem is that I live in CA.
I could move but that will not happen.

Thanks,
J
Link Posted: 1/28/2006 11:30:28 PM EDT
[Last Edit: 1/28/2006 11:31:10 PM EDT by eye_spy]
Generally, all uppers and lowers are all standard. They will all fit. (I say generally, because ther ARE some uppers and lowers that may need a little work for them to fit properly.)

However, aren't there Colts with larger front takedown pin holes? I do not know which model this is but in that case, you may encounter some problems with that if that is the type of colt you have.
Link Posted: 1/28/2006 11:39:08 PM EDT
[Last Edit: 1/28/2006 11:44:31 PM EDT by jollyroger]

Originally Posted By JAN44:
I would love to buy a new rifle, but the only problem is that I live in CA.
I could move but that will not happen.

Thanks,
J



OK? My advice still stands, stick with a good brand of upper and you'll be fine.

Also, like was said earlier check to see if your front take down pin is the "large version"
Link Posted: 1/30/2006 11:24:20 PM EDT
Link Posted: 2/2/2006 1:44:08 PM EDT
Link Posted: 2/2/2006 1:47:49 PM EDT
think the sp1 has the larger front pivot pin
Link Posted: 2/2/2006 6:03:02 PM EDT

Originally Posted By eklikwhoa:
think the sp1 has the larger front pivot pin



I think so too.
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