Changing from AR15 A1 upper to an A4 upper

Discussion in 'Gunsmithing' started by tex45acp, Mar 21, 2009.

  1. tex45acp

    tex45acp Active Member

    Mar 13, 2008
    South Central Texas
    Well the winds of luck blew in my direction. I went by a buddies house to look at his new Colt 6940...nice gun!! I made mention that I was going to have to buy the upper assembly vise block to change out to my new A4 upper I had recently purchased, and he went and got one out of his tool chest along with a multi tool, which I already had. Using the block was the way to go and it took all of about one hour to make the switch. Everything went into place perfectly and I was just amazed. Now I have a more versitle gun gor home defense and just fun shooting. I think I will keep the A1 upper for a future retro build I am thinking of...who knows??? Here is the finished product and everything I want to do to this little Bushmaster except finding a rear folding sight.

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