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7/31/2007 2:05:18 PM EDT
I would like to trade in my Bushmaster A1 upper for an A2 upper.  I am a newbie so bare with me but I want to know about approx. how much more $$$ would I have to contribute or if this is even possible?  
7/31/2007 2:14:44 PM EDT
[#1]
Don't do that.  Trade it in for an A3 upper.  So you can add optics later on if you want to.  Thats my opinion.
7/31/2007 2:28:52 PM EDT
[#2]
If you ever plan on adding optics get a flat top.

I'd just keep the A1 and buy the other upper or even just swap the barrel and related parts onto a flat top upper. They are $99 just about everywhere and about 20 minutes worth of work for a gunsmith.
7/31/2007 2:34:33 PM EDT
[#3]
you can check this out: www.ar15.com/forums/topic.html?b=3&f=4&t=226782
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