Originally Posted by
flyrodr
The Rattler comes in two versions, the SBR and PCB. You want the latter (Pivoting Contour Brace), the features of which have satisfied the ATF's definition of "pistol". It comes with that brace.
No knowledge of the Springfield Edge.
Trunk safe: There are many variations and degrees of security. If you're not intending to more/less bolt a box into the vehicle (not a simple task on many, as there are many places you wouldn't want to drill a hole, e.g., gas tank, exhaust system, wiring harness, etc.), but instead are going to attach it with a suitable cable/padlock, you could simply swivel it around if you access it from the rear seat back opening. A cabling system, of course, assumes you have an accessible seat frame or other substantial element to fasten one end of the cable to. Not as secure as a bolt-in, but either way, you will want to determine which is your weakest "link": your lock, hinge, cable, mounting system, etc. And which set up is satisfactory for your needs (just a weapon, or also other valuables, etc.).
Lots of post-purchase options. Beginning with sights, as the Rattler comes without. Best to proceed slowly, as there are lots of attractive, expensive options. Some are well worth the cost . . .
The threads you've been reading on P-F have lots of terrific suggestions.