Yes, it's marked underneath. All someone would need to do it pull the lock at minimum, very simple.
The muzzle treatment is something I've been working up on these 'new originals,' and it is absolutely harmless to the bore. It only extends a few inches down, just for effect, and can be removed without much ado if someone wants to shoot it. No matter how much I age any of these up, they nevertheless are solid and fully functional. On this one, I am also aging up a more appropriate nipple for use if shooting is intended; the nipple on it now is bashed and mushroomed too much for actual use, but can easily be changed out.
The triggerguard is a true antique and in fact is the actual guard that Reeves used as a pattern years ago to make his castings of this same guard. It actually was partially cracked through the front post and repaired, but I wanted a stronger repair for actual use. I know of two other original guards of the same pattern, with very similar bow engraving, but unfortunately not one of them has survived on a gun. Reeves always listed these as 'Hudson Valley' but they're really a bit on the small side for a HVF. I suspect they were being used on early to mid 18th century trade guns of some kind, probably German or Low Countries, but as yet I've not seen one on a complete surviving gun.