Just looked it up, it's what I thought it was. The disconnect pin should have slid out without too much resistance. It may have been a replacement that's slightly oversized. I was given one of these rifles that was missing the bolt, hammer and a few other small pieces. I was able to find everything on Ebay except the cocking handle which I made. They are not bad rifles other than being Mossberg ugly. I find mine runs kinda slow compared to other semi autos. It is fairly accurate.