best take it to a gunsmith. could be several reasons for failure to eject. gunsmith would find the problem.....................
100-500 usd
1977
Go to http://stevespages.com/page7b.htm and scroll down to Colt Lawman MKIII/Trooper MKIII It will give you the manual with exploded view.
your colt lawman mkIII was made in 1978.
Around 1970 based on proofhouse.com.
You need to contact Colt for a correct answer.
Sometime between 1972-1978.
your colt trooper mkIII was made in 1978.
Need the serial number.
0-550 usd
Sometime after 1978. Sn 1001L began in 1978.
You need to see a gunsmith