Colt STAKES their castle nuts, as they should do... Look closely at the inside (closest to charging handle) of the castle nut. You will see two or three little dimples on the corner edge. See if the plate the nut holds in place has been staked. You will need a small punch to move that staking out of the dimple. Once the staking is removed it should unscrew without too much effort...
Here is a thread about staking... Removing the stake is often trickier...
Staking Comparison
Rmpl
Last edited by Rmplstlskn; 03-31-11 at 21:02.
"Our destruction... will be from another quarter. From the inattention of the people to the concerns of their government, from their carelessness and negligence..."
...Daniel Webster, June 1, 1837
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