One side of the locking lugs are on the underside of the bolt. The other side is on top of the oddly shaped little locking piece under the bolt which is cammed down by the big oddly shaped piece when the cannon recoils. If you take the cannon (Upper on a browning action pistol.) off, it will not lock by itself, unlike the Luger cannon which does lock with out the rest of the pistol. This is one of those cases where a picture is worth a lot of words.
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