I did love the design of the guns they used, and I haven't watched the series in a while but I do remember one episode you can see a hand off camera handing someone their gun which was supposed to have just materialized out of nothing.
Which might not have been visible in the original broadcast. Older TVs had slightly rounded frames that covered up the extreme edges of the picture, because CRT images often had rough or distorted edges. So it was assumed that things right on the edge of the frame wouldn't be seen. But these days, our HDTVs and digital video windows display the whole image, so we occasionally see things along the edges that were originally hidden.