Hey everyone, this is my first post and I am hoping that someone can help me out.
The rifle is a Mossberg 100 ATR that I got over Christmas this last year. It has had maybe 50 rounds put through it. The scope that it came with was garbage and I took the bases off and heard a little rattle. I took out the bolt and this fell out. I've looked at the owners manual from Mossberg and couldn't identify this piece from their schematic. https://www.flickr.com/photos/johnso...7645164439414/
If you would like to look at the schematic. http://www.mossberg.com/manuals/100ATR_en.pdf
Does anyone know what this is?