Just received my mossberg 500 field model (#56420). To my extreme displeasure the forend appears to be pinned and I don’t see any action slide tube or castle nut at all. I specifically chose the 500 over the Maverick 88 because I wanted the tang safety and slide tube to change forends as I see fit. The model on the website does not have a pinned forend. Is this typical? Am I wrong to assume I ordered the action slide tube assembly when I ordered a 500?? It feels cheap and has tons of slop to make matters worse.. thanks for your advice!