Looking pretty nice so far, just a few things that immediately caught my attention. *The hand strap on the bottom of the slide looks like either thick cut rubber or aluminum and not a nylon strap. *The action slide bar 'the bars on the back of the slide that work the load action' should be two seperate thin bars not one…
The broken down shotgun is a Remington model 870, but all shotgun components are basically the same. The two prongs or the actual important pieces of the slide really operate a lot of the shotgun so, despite being seemingly minor, they're drastically important for a pump-action shotgun. But that pic should also give you a…