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It really depends!

What's the manufacturer? If it is Colt, it has a model number on the receiver. Post that here.

20" barrel, triangular front end, and no FA usually makes it a straight AR-15. We use M16 nomenclature to talk about the differences between types. A1 addedd the FA, I believe, and A2 was the new sighting system.

You might have an SP1. I'm not that familiar with the earlier Colts.
 

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Not sure if there were.

Do you have a model number (not serial!) off the lower receiver?

The AR15.com site is SO SLOW right now. A couple of years ago they had an "Identification" page for Colt AR's. Let me see if I can find it.
<later>

Couldn't find it there, but here is a link that may help you:

http://www.biggerhammer.net/ar15/variants/

Looks like an SP1, the original AR-15.
 

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Originally posted by SaxonPig
Well, I am still a little confused. I went to the site linked above and according to the info there the early SP 1 should have the three-pronged flash hider but mine is the birdcage type. The mystery continues.
It could easily have been changed along the way to the birdcage. In addition, don't put 100% weight behind that page. Your mileage may vary.
 
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