Mossberg 500 tactical build

Since the weather is getting a little to cold for me to get out and fish I have been putting a little more time into a few of my other hobbies. Started out as a basic Mossberg 500. I added a side saddle 6 shell holder, a AR-15 six position stock, 3 picatinny rail forend, a pistol grip for the forend, light with a hand on/off switch, breaching barrel and a red dot laser scope. Just waiting on a heat shield. I'm going to start building an AR-15 next month.

The ar stock
http://i237.photobucket.com/albums/f...ps129273cb.jpg
Complete
http://i237.photobucket.com/albums/f...ps491ab872.jpg
http://i237.photobucket.com/albums/f...pse41e1caa.jpg
http://i237.photobucket.com/albums/f...ps1336438a.jpg

I have the 509 standard stock it has a 7-8 round mag and 4 in the stock where did you get the light and mount

Got the light off amazon. Its a UTG xenon ZL168. Very affordable and after 30 rounds it hasn't moved. The mount is part of the forend. Came with 3 rails