Go to www.brownells.com and type in part number 940-000-983 for the sear housing block assembly with no internal lock, or part number 940-000-982 for the sear housing block assembly with out the internal lock or mag disconnect. $25.77
Or you can get the replacement blocks from S&W, they are the same price as Brownells.
Remove the rollpin, and replace the block, reinsert rollpin. Viola! No internal lock.
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