Like they said. It's a fixed internal magazine where the bottom floor plate opens out like a small door. So, imagine the floor plate of a detachable magazine except that floor plate has a hinge at the front end where the plate opens out, but the magazine does not detatch, the magazine spring and follower are also attatched to that floor plate. On the 700 BDL the floorplate release is a flush square button in the trigger guard just forward of the top of the trigger.
A word of advise with that 700 BDL. Don't allow the bolt to slam forward on it's own. It will easily do that when the action is open and the rifle is pointed muzzle down. Also the 700 BDL will need to be fitted with a much better aftermarket rubber recoil butt pad. Consider a Pachmayr butt stock recoil pad. For some odd reason Remington has found it cheaper for them to put a basic hard plastic butt plate on that gun, and those tend to really make shooting it (in a caliber like .30-06) very uncomfortable. Hope this helps.
Let me start off by saying that I am a scaredy cat.
For someone that spent 3 years in 82nd Airborne jumping out of all manner of military aircraft, my friends find this ludicrous - but... it is what it is!
Climbing stand? Yep, still scared - put me up 15' and that is about it.
Ladder stands? I am better in these - but still cautious.
Chain on stands? Used to love them, now they terrify me.
I was once ridiculed for putting chain on stands waaaay too high - some of my friends...