Hi voltage,
It sounds like the spring that is pressed into the side of the receiver and then held in place lightly by a couple of punch marks. These commonly fall loose when you remove the trigger assembly.
But they shouldn't fall out unless you do remove the assembly. The end of one of these flat-springs keeps/releases the next round from the magazine I believe. (to be honest as many as I've tapped back down to reassemble an 1100/1187 it has been many years ago so my memory is fuzzy)
If it fell out while hunting either I've got the wrong picture or it is a broken part. I'd tap the two pins out that keep the trigger assembly in and drop the assembly out. (Good time to rinse out the trigger assembly and receiver too)
The other half of that spring may still be in the receiver. There's a spring on both sides of an 1100 (I think).
Regards,
TB
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