My guns, Colt 733 upper

For a while now I have thought about posting about my personal firearms.  Wasn’t quite sure how I should approach the subject.  I’m going to start with my Colt 733 upper.

Above is an old picture, below is a picture taken today.

Sometime about 2004-2005 CMMG got in a bunch of trade in Colt 733 uppers and sold them cheap.  I thought about getting one, but waited, and missed out.

A few years back I saw a police trade in 733 upper for cheap, so I bought it.  Then, of course, I found a nicer one for sale cheaper.  So I bought that one also and sold the first one.  This upper in these pictures is that second 733 upper I had.  It is great that I can keep multiple uppers laying around and swap them out as I see fit.

The Colt 733 has a lightweight 11.5 inch barrel with a 1:7 twist.  Fixed A1 sights and a brass deflector (often called a C7 upper).  The bayonet lug is shaved.  It came with the Colt 6 hold “CAR” hand guards (as opposed to the wider/taller M4 hand guards).  This makes for a very lightweight upper.  This configuration is so light and handy it feels like a toy.  It was also called the M16A2 Commando.  They have been used in a few movies like Black Hawk Down and Heat.

The only change I’ve made to the upper is that I replaced the A1 rear sight with a vintage military low light sight.  The A1 rear sight has 2 peep apertures set for different ranges.

These old military M16 night sights were meant to be used with a Promethium 147 night front sight.  This system was obsoleted with out a replacement.  The large aperture opening is larger than an A2 rear sight, and is on the other side than an A2 sight.  So you flip it the other direction as an A2 sight.

I like to think of my firearms as “combat ready”.  But realistically many of them, such as my 10/22 are not really any where near that.  But this configuration can fire modern high performance ammo, and make the hits when I do my part.  This 733 short barreled rifle is something I would feel confidant to use in a fight, but it would be far from my first choice.  Given the choice, I’d rather have an optic.  If I could only have one AR, it would not be this.  But I’m not limited, so this is a fun gun to have.

2 thoughts on “My guns, Colt 733 upper”

  1. I love the nostalgia of the older AR’s and am always interested in seeing what people have in their collections.

    Thanks for sharing details on the sights. I was not aware of the night sights.

  2. Love the originals. Always reminds me of being a young troop and the “GAUs” we had around in those days.
    I was never a fan of the original A1 rear sight apertures and have swapped my, albeit not all original Colt but still A1 patterned upper, to the A2 aperture. My shooter is based on our old GUU-5Ps though.

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