The most amazing part to me was this: its magazine follower holds the slide open after the last shot, when the magazine was removed, before the slide was released, the hold open latch kicks in, so the slide was kept open (slide did not move!). When the magazine is inserted again, the magazine follower does not return to its previous slide-blocking position and it's pushed down by the bolt, the magazine body wall releases the hold-open latch, and slide returns to battery.
The thing was designed working marginally, requiring very accurate machining. But amazingly it's very reliable.
It's not chrome plated
