Got this a while ago with a broken blowback unit. Turns out the little lever that throws the bolt back had snapped. I believe the faux bolt has been shot at some point and it getting bent is what caused this issue. To be clear the recoil mechanism all functions perfectly. Its just that the faux bolt no longer moves when shooting. I have bent it back into place and fixed it all together inside the gun. you can still pull it back to adjust the hop but it and the faux carrier will need replacing if you wish to have the blowback. When the gun came to me the buttplate had snapped off. I have used a small piece of steel to fix this. The length of the stock cannot be adjusted with the butplate on.
The gun comes with 7 midcaps and 1 high cap. The red dot, and magnifier will not be included but the foregrip will be.