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some of the production models have a S spring thats retained by the front lock bolt . the spring retains friction on the rr so it will not simply fall out . if someone put the spring in backwards and the rod has a brass end , or the rod is alittle rough , it can catch .
to check if thats the case , simply pull the barrel key and lift the barrel out . you should see the spring in the channel . with the bartrel out you can then remove the spring
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