Today UPS delivered my compressor and I charged my Marauder and loaded the mag,or thought I did. Looked simple enough, but it would not let the bolt go forward! The mag didn’t have a pellet in position for the bolt to close. Any idea what I’m doing wrong? And is there a single shot device for the pistol? If it wasn’t so hard to load as is I wouldn’t cate about using the mag as I prefer single shot any way. Charles