Ahh Mossberg 500, I enjoyed doing mine :), need any help on certain parts I may be of some help. http://bencottage.co.uk/images/mossberg_500_7.png http://bencottage.co.uk/images/mossberg_500_5.png http://bencottage.co.uk/images/mossberg_500_8.png http://bencottage.co.uk/images/mossberg_05.png
The barrel has a pretty significant taper towards the chamber. Your barrel right now looks very straight. Also, the overall diameter could probably get fattened up a bit. The magazine tube also needs to be a good deal fatter. The diameter of the barrel where it inserts into the receiver, and the magazine tube should be the…