This is my CGG (Carrot's Generic Gun) with attachments. The red dot sight is similar to Red Book Of Westmarch's so credit to him
Step 1: The Main Gun
The RAM rod is a grey/black rod will a red connector and a green rod making an "L".
Step 2: The Stock With Headrest
Step 3: The Magazines
The mag pusher and the way to reload is the same for both magazines.
Step 4: The Sights
You should be able to figure out how to attach these to the gun using the intro.