Good question. This uses Holland's most prominent style of takedown system. Some call it a take-apart.
1. It has a large captive screw in front of the magazine in the bottom metal that can be loosened with something like a coin or screw driver.
2. Then the barreled action tilts out of the stock while the bottom metal stays captive within the stock.
3. The rear tang is machined such that the portion with the action mates up to a corresponding section that is captive in the buttstock along with the bottom metal. This holds the action securely to the stock from the rear when assembled.
The whole operation is very simple and easy and no special tool is required other than a slender coin or screw driver (if available).
Many hunters preferred this type of takedown, accuracy-wise, as the barrel stays properly torqued and headspaced to the receiver as opposed to a screw apart where the barrel is removed from the receiver when taken down.
I will try to show some pics to illustrate:
Large captive coin slot screw that is loosened:
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Rear tang section machined to mate to corresponding piece captive in the buttstock when the barreled action is tilted out:
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Voila! Taken down for storage or transport. Nice and neat:
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