Top:  Barrel with twin lugs at the rear and recoil buffer spring.
Bottom:  Frame with two slots to hold the barrel.  The recoil buffer block is stamped with a star and rests on the disconnector cradle.

Top:  Slide with raised portion that activates the disconnector.
Bottom:  Frame with recoil buffer block on top of the disconnector cradle.  You can see two tabs of the disconnector cradle on either side of the block.

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