Smokepole,
Yes the bolt stop still is an additional function of the sear. The new style sear is basically the same as the old one as far as trigger/sear engagement and bolt stop functions go. It just doesn't have that exposed tab on the right side of the receiver anymore. In the new design the bolt release button (in front of the trigger guard), when depressed, contacts the sear and pushes it back, lowering the bolt stop.
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