I'm currently in the process of upgrading my brother's BNIB Colt 6920. I am installing BCM's new KMR-A to replace the standard handguard setup. I wanted to chop the front sight base in order to give him the proven reliability of the pinned GB.
The front sight removal went without a hitch simply because I used the right tools for the job. Brownells sells everything you need to get it done in 15 minutes.
This punch is specifically tapered for the pins to prevent them from slipping.
http://www.brownells.com/gunsmith-to...prod26485.aspx
This bench block supports the front sight/gas block/barrel so that you can knock out the pins. It also properly directs you in which way to take out and install the pins.
http://www.brownells.com/gunsmith-to...prod20727.aspx
With the receiver wrapped up to keep it from getting scratched, I placed everything on the garage floor to give good support for the bench block . Using a 16oz hammer I had the pins out in no more than 5 minutes. This was the part of the "job" I stressed out the most over and it went without a hitch. I was taught to strike the punch solidly, not tap in order to get the pins to move.
I used a Smith Armorers tool in combination with a breaker bar to remove the barrel nut, also without issue. The KMR comes with it's own barrel nut installation tool, so I won't need the Smith A/T for the install. I would also recommend using a good quality torque wrench to install your new barrel nut for what ever rail you plan on installing.
http://www.brownells.com/gunsmith-to...prod24190.aspx
This stuff is not rocket science provided you use the proper tools and patience.
Last edited by Slvr Surfr; 11-01-15 at 15:44.
Reason: spelling
Life's a risk, enjoy the adventure - HOPLOETHOS
Bookmarks