Could anyone give the instructions on how to remove the rear sight assembly from my A2 upper?  I want to upgrade it to a DCM A2 sight assembly.

Thanks

Frontsight

I believe you just start cranking on the elevation adjustment till it comes free.

Jack,

Thanks for the suggestion but thats the first thing I tried and it just stops at the highest elevation.

Frontsight

Damn. I guess all the flat tops I have have ruined me

try this
ar15.com/content/manuals/TM9-1005-319-23.pdf

Basically here's how you do it.  You drive out the roll pin directly under the sight.  A spring will come out from inside your lower when you do that, so have something prepared to catch it with.  Then you can simply wind the elevation knob until it comes out.  Once again, there is a very small ball bearing and spring in the sight base, so be prepared to catch that as well.  The elevation knob can them be removed from the receiver.  It also has a small ball bearing and spring that will come out of the receiver so be prepared to catch those as well.

Installation is basically the reverse, but can be tough without special tools.  Those springs and ball bearings travel a long way when they eject themselves out of the receiver.

Mongo,

Thank you for the info, I really appreciate it.  Where can I get the special tools for this?

Frontsight

Quoted: Mongo, Thank you for the info, I really appreciate it.  Where can I get the special tools for this? Frontsight

Check out this link:

AR Tools

Go down the page and look for the rear sight tool on the left side of the page.

Mongo,

Thank you again.

Frontsight

Becareful with the elevation disk as well, it's actually 2 pieces with a pin that determines where the 3/6 (or 3/8) marks line up, if your not careful those can go back together different and mess up where the elevation bottoms out.

jjmcrowell,

Thanks for the additional heads up, appreciate it.

Frontsight