I am going to put together a new tactical shotgun using a Mossberg 590A1, 18.5". I thought it might be interesting to show pics as the project stumbles along. I shall show each stage and explain my thinking behind why I have done something or used a particular component. First off: Why the Mossy? It is a bulletproof design that. In use with the US military where it has been abused and misused for a good few years. The only niggle tht seems to pop up from long time users is that the magazine tube spring is a tad under powered and in some weapons prone to binding up. Other than that it works fine and according to Louis Awerbuck, former Chief Instructor at Coopers Gunsite, in his course delivery experience he has seen more problems with the Remington 870 than he has with the Mossy......Louis was contracted to deliver courses to the USMC so you can imagine the number of guns on the line at any one time. Pics to come.