When the bolt is closed, the spring is not exposed. In fact the only way that spring comes out with the bolt closed would be for the action to explode.
The lower part of exposed spring is covered by the bolt body once assembled. The remaining exposed portion is covered by the lug abutment in the action when closed. It literaly cant come out unless the action blows apart.
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The Sako example picture you posted is not in the lug, it is between lugs. That may or may not be the case with the deviant, but it is a huge difference.
When it comes to engineering and machined parts I'm not just being a fan boy. This is a fully developed system. Ted has obviously spun this thing around looking at it from every perspective.
Here is another piece of the extractor design Ted thought of. Haven't seen this mention yet. Notice the hump left in the action opposed to the extractor with the bolt closed.
The cone breach restrains the front. Action restrains the side. It's not coming out unless everything is blown to pieces.
The 12:00 Higbee thread start is tits also.
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