That's ridiculous.

I registered a rifle that came with 3 barrels:  .22LR, .22WMR and .17HMR.

When I bought the rifle from a 2A member, it was registered as a .22LR. 

When I registered, it had the .17HMR barrel installed.

The RECEIVER or FRAME is the firearm by ATF definition.  If you switch parts, the serial number still follows the firearm.

As for your receiver, most AR lowers I bought had MULTI as the caliber stamped on it.  There's a reason for that.   

If they registered the lower as "MULTI" when you bought it, the registration is correct no matter what barrel you install. 

So, if you install a .223 Wylde barrel, doesn't it also use 5.56 caliber ammo?  Also, a 5.56 barrel shoots .223 ammo.  No barrel change required.   

I'd like to throw a P320 at them and see their heads explode.  That pistol was designed and marketed specifically for locations and individuals who want or need a limited number of registered firearms but with the capability to change calibers, frame sizes, threaded barrel vs. not threaded, etc.

I'd ask them where it states in the law that barrels of different calibers are not allowed to be swapped on a registered firearm.  If they can't point to it, then I'd just ignore them.  Sounds more like a policy than a law.  You can't get a "charge" if there's nothing in the law or ordinances saying it's prohibited.

I'm not a lawyer, so don't take my advice as gospel.   But with the number of caliber-swappable firearms legally available here, and with no mention of them in the statute, they'd be hard pressed to find a law you broke.

Remember how I told you guys that Russia has already won Ukraine and it was just a matter of time until it was obvious to everyone, but you were too drunk on CIA propaganda at the time?

Here's another one for you,...Israel is not gong to exist much longer.

Care to put any specificity to that prediction?  How long is “much longer”?

Like Sly would say, "They drew FIRST BLOOD......."

It's obvious that these employees do not think because anyone should know that there is a right way to do things and a wrong way.  Same goes with the Mona Lisa paint attack and like all over Europe.

I was talking to an old timer and he saw the videos. What he said was "back in the day, if you did some dumb shit like this, you would get punched in the face. And the puncher wouldn't get arrested. This is what happens when bad behaviors are protected from consequences".