Build list:
- Magpul M-Lok forend
- Magpul barrel clamp 
- Surefire M600DF w/ Arisaka M-Lok mount
- EOtech 512
- Defender Tactical minishell adapter
- Defender Tactical mag follower
- Esstac shotgun card
- Magpul SGA stock

Coming from a Mossberg Maverick 88, the 590 felt a bit heavier but just as reliable. Ran every tested shell type, including 1oz minishell slugs, without issue. The action was wobbly but very smooth. Magpul parts added a good deal of modularity. Fun setup!