After filling the FC pocket, you can cut and glue a trigger into position.
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After filling the FC pocket, you can cut and glue a trigger into position.
You really do need a local resource for that data, as others have stated, as the legal definition of "deactivation" varies considerably from one country to another. For example, for automatic weapons, what meets the bar in Germany (cut bolt and drilled barrel) completely fails to satisfy US requirements (cut receiver). It can also vary from one weapon system to another, depending upon the physical characteristics of the weapon, and which components are actually subject to registration.
I do understand that we're talking rather specifically about stripped lowers here, but if those are weapons under Norwegian law, then I suspect torch cutting (component destruction) or some kind of specific welding (rendering them permanently inoperable) would be the only acceptable methods.
At the very least, I would see if perhaps an expert in the Euro zone could field the question for you.
AC
This sounds good in theory, but if let's say here in NJ you call the local PD or even SP and they tell you it's ok to have a collapsible stock this carries no weight in court. If they stated this to him in writing from the right department then that could have some impact however.
OP I suggest you make additional attempts at contacting the right people for the right answer, eventually someone will point you in the right direction. Ask for a link to something in print and official. If that doesn't work and you think there is almost no chance for any sort of inspection beyond a quick handling and glance then I'd simply improvise as needed.
I would want something in writing from whoever has the authority to prosecute you in your area before making a decision on how to deactivate the lower receiver.
I wonder if it wouldn't make more sense to just get hold of the most realistic airsoft replica you can find for your display purposes.
The display angle isn't the real issue here. The problem is that the lowers are already on-hand, and presumably cannot be completed.
I'd install enough parts to look correct (trigger and pins), propose welding-up the entire FCG to the point where nothing was usable, functional or removable, and see if the local authorities would be willing to document their acceptance of this particular solution.
AC
I realize this isn't exactly what you asked, but something to think about..
Make a cutaway for display; aggressively remove material showing inside the mag well, and trigger group, leaving the take down pin holes and receiver extension threads intact. Assemble it, but weld and/or epoxy the trigger group in since it will be missing the support of the pin holes on the near side. Color the cut edges in red for effect.
It would be a lot cooler to look at, and more educational than an inert looking gun shaped object.
What if you just cut a square through one side of where the hammer pin is, then weld the tip of a hammer pin on the display side for show purposes (weld from the inside so it isn't as obvious for display purposes, but can be turned around to see). Then you can regularly install a trigger that can be pulled, but no hammer could be installed?
"As stated, the intention now is to use them for the showroom, but in order to do that we need to deactivate them. We are currently applying for a firearms dealer license, but since we do not have one yet, we cannot have working weapon parts on display.
It might end up with us having to cut them in half, but I was just checking to see if anyone knew of a way to render them inoperable without destroying them."
Could it be as simple as taking out the lower parts?