Multiple caliber kits / conversions question about serial number

Ronws said:

Probably a stupid question and I am good at that.

When Hornady came out with the 7 mm PRC, they pointed out that if you already had a 7 mm Rem Mag or .300 Win Mag, you could swap barrels and even use the same bolt face.

LIke any rifle where you might replace a barrel or trigger assembly, you don't need a 4473 federal transfer. Because those are replacable and not serialized. The receiver is holds the serial number.

So, if you put a 7 PRC barrel on a .300 WM receiver, is it still legally a .300 WM, which is what it was when you bought it and transferred with a Form 4473?

Do you run afoul if you don't file a change of caliber associated with that receiver?

Does it matter? The SOCOM MRAD, which you can buy, has .308 Win, .300 Norma Mag, and .338 Norma Mag barrels and parts. Only one receiver presumably having the serial number.

I try to foresee ways the commies could come at us and worry about crap like this.

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Ronws said:

So, setting aside the multi-caliber AR-15 or AR-10 kits, if I have a .300 WM and change barrels to a 7 PRC, is it still legally a .300 WM?

That is, if it was purchased as a .300 WM and described as such on the 4473 during transfer, is it still legally a .300 WM in spite of having a 7 PRC barrel on it?

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Ronws said:

So, setting aside the multi-caliber AR-15 or AR-10 kits, if I have a .300 WM and change barrels to a 7 PRC, is it still legally a .300 WM?

That is, if it was purchased as a .300 WM and described as such on the 4473 during transfer, is it still legally a .300 WM in spite of having a 7 PRC barrel on it?

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oldnewguy said:

Call your local ATF field office and ask for the Change of Caliber form.

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Ronws said:

So, setting aside the multi-caliber AR-15 or AR-10 kits, if I have a .300 WM and change barrels to a 7 PRC, is it still legally a .300 WM?

That is, if it was purchased as a .300 WM and described as such on the 4473 during transfer, is it still legally a .300 WM in spite of having a 7 PRC barrel on it?

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Ronws said:

I was talking about rifles but I think I figured it out. As far as the dog killers are concerned, the rifle entered your ownership as a .300 Win Mag.

You change it, with the same serial number on the receiver or action, to a 7 PRC. That won't matter until you transfer again and it is just small type to note the caliber.

If there was an investigation involving the rifle, it might be tracked down and noted that it was sold as a .300 Win Mag and they would have to find where you bought it from because that location would have the 4473 on file.

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