What you have is what used to be known as a "scope safety", an aftermarket safety usually, though I do not know if your FN came with one, or was changed later.
many thousands were sold (and I believe still are) by Numrich Arms, and there were a few other makers as well. It was a drop in replacement for the military safety, and works exactly as you describe. You CAN, if you wish, have it modified so it does not lock the bolt shut, but, of course, you'll have to get it apart, first.
Here's how you get the bolt apart, it is easiest with three hands, but you can do it with two...
First, you will need a firm, square edge, like the edge of a workbench. Remove the bolt (uncocked, safety off).
Put the edge of the sear against the edge of the bench, (DO take care not to damage the sear face!!!) so you can push the bolt body down, against the firing pin spring tension, until the cocking piece clears the bolt body, and you can rotate it into the cocked position. (this is the three hands part, you have to keep the sear from slipped off the edge of the bench, and pull the bolt body down at the same time, then rotate it until it lines up with the cock notch.) Actually easier to do than describe.
THEN, once you have the bolt cocked, put the safety ON. Then depress the little button on the front face of the bolt shroud, and unscrew the entire assembly from the bolt body.
To take apart the firing pin assembly, you will need a different thing to push against. GI Mauser stocks have a metal disc with a hole in it for this. You need to find something that will take the firing pin tip, but push against the shoulder of the firing pin (so as not to damage the firing pin tip)
When you have this set up, push the bolt shroud down/forward FURTHER compressing the firing pin spring. KEEP THE TENSION ON the spring, when you have compressed it enough, the cocking piece clears the bolt shroud, and then can be rotated 1/4 turn to disengage it from the firing pin. Then EASE OFF the pressure and everything will just come apart.
Reassemble in reverse order, leaving the bolt cocked so it can be reinstalled in the action. It's actually pretty easy to see how it goes together, once you have it apart the first time.
Alternately, you can (pad & protect) the sear, clamp it in a vice and do it that way. Anyway you do it, you will have to overcome the firing pin spring to cock the bolt, before you can take it apart easily, and overcome the spring again to strip the firing pin assembly. An average adult can do it, though it does take a bit of strength in your hands.
Hope this helps.
many thousands were sold (and I believe still are) by Numrich Arms, and there were a few other makers as well. It was a drop in replacement for the military safety, and works exactly as you describe. You CAN, if you wish, have it modified so it does not lock the bolt shut, but, of course, you'll have to get it apart, first.
Here's how you get the bolt apart, it is easiest with three hands, but you can do it with two...
First, you will need a firm, square edge, like the edge of a workbench. Remove the bolt (uncocked, safety off).
Put the edge of the sear against the edge of the bench, (DO take care not to damage the sear face!!!) so you can push the bolt body down, against the firing pin spring tension, until the cocking piece clears the bolt body, and you can rotate it into the cocked position. (this is the three hands part, you have to keep the sear from slipped off the edge of the bench, and pull the bolt body down at the same time, then rotate it until it lines up with the cock notch.) Actually easier to do than describe.
THEN, once you have the bolt cocked, put the safety ON. Then depress the little button on the front face of the bolt shroud, and unscrew the entire assembly from the bolt body.
To take apart the firing pin assembly, you will need a different thing to push against. GI Mauser stocks have a metal disc with a hole in it for this. You need to find something that will take the firing pin tip, but push against the shoulder of the firing pin (so as not to damage the firing pin tip)
When you have this set up, push the bolt shroud down/forward FURTHER compressing the firing pin spring. KEEP THE TENSION ON the spring, when you have compressed it enough, the cocking piece clears the bolt shroud, and then can be rotated 1/4 turn to disengage it from the firing pin. Then EASE OFF the pressure and everything will just come apart.
Reassemble in reverse order, leaving the bolt cocked so it can be reinstalled in the action. It's actually pretty easy to see how it goes together, once you have it apart the first time.
Alternately, you can (pad & protect) the sear, clamp it in a vice and do it that way. Anyway you do it, you will have to overcome the firing pin spring to cock the bolt, before you can take it apart easily, and overcome the spring again to strip the firing pin assembly. An average adult can do it, though it does take a bit of strength in your hands.
Hope this helps.