[Any opinions on Midwest Industries M4 MLOK Rail]

It feels solid, but I have only taken it out to shoot once. 

I was able to leave it on when I disassembled it to change out my recoil tube, just loosened the bottom brass set screws.

 

[Benelli M4 6 position Recoil Tube]

Got mine today. Should have time this weekend to install it.

[M4 Picture Thread]

Benelliparts.net Benelli M4/ M1 M2 M3 Undiscouraged Trigger kit and magazine follower 922r package
DMW Benelli M4 1 peice 2 Round Replacement Tube
DMW Benelli Oversized Safety
DMW Tactical Bolt Handle for Benelli M4
Battle Steel Benelli M4 Top-Rail for Holosun HE509T
Benelli M4 Recoil Spring Tube, 3 Position & Retaining Ring
Benelli M4 Aluminum Trigger Guard

Plan to add later:
MI handguard on back order 
Mossberg 500 heat shield on stby 
Aridus Q-DC (have them on my other shotguns and converted a carrier with some aluminum flats to stick a loop strip on to use hook shell cards)