Quoted: An issue with this topic never discussed, but equaly appropriate, and the right way to fix this problem would have been to ensure the disconnector retained the notched hammer below the striking dimension. One of the tasks the disconnector is required to preform during cycling of the action is proper hammer retention and it sounds like this retention dimension should have been examined before secondary fixes were implemented.
Just a thought.
JohnM at Home
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In order for the disconnector to retain the hammer, the carrier must lower the hammer past the engagement point of the sears. Simple put, the hammer is going to make contact with the carrier/firing pin collar as the carrier passes over (Non shrouded bolt), even when the disconnector is positioned to retain the hammer (No third/lowest engagement point of the Auto sear on the hammer hook).
The problem is not the retention of the hammer on the disconnector, but the angle/contact point the firing pin collar is going to make with the hammer as it moves across towards Bolt lock-up.
Again, the solution when using a non-shrouded carrier is to relieve/lower the top edge of the firing pin contact pad (referenced angle of the hammer to the firing pin collar when items are not within the original SP-1 spec) to allow the beginning glide point of the firing pin collar to be within the contact area (smooth surface) of the firing pin pad, and not at the very beginning of the hammer pad end edge.
Trust me, no one is trying to re-invent the wheel. We are just trying to bring the rifle systems back into tune when one or more items are not within the original spec of the SP-1 (what most current semi systems are based upon).