The 486 is a true triggerplate action with the locks mounted to the triggerplate and it uses leaf springs instead of coil springs for the hammers. It is certainly not an A & D action where the locks are located inside the action body. It differs from The Scottish "Round Actions" in that they use large bow springs to drive the hammers. The cocking arrangement is totally different and the ejector mechanism is also different. The Scottish guns have the ejectors within the action body and trigger plate.
The 486 has forend ejectors, presumably similar to their modern O/U guns...
I have handled the 486 with 28" and 30" tubes and the 28" is really nice. I thought that the 30" tubes were too long although I am a fan of longer barrels. They were just not in proportion.
Certainly the closest to a Scottish gun as a mass produced firearm can get.
I would prefer a Dickson but they are in a totally different cost category...
