Hello
Please tell us what the identifying markings are on the choke tube, are they Spdr, IC, Mod, Full, Superfull, or a three digit number, or ??
The 12 gauge trumpet choke is the speader and a loaded 12 gauge shell should drop down inside the choke tube to be caught on the rim.

Of course, remove it BEFORE shooting

Let us know soon
Mike


USAF RET 1971-95 [Linked Image from jpgbox.com]