First post to the forum. Nice seeing people building custom Cam870's and liked all the shotty's on this thread. My 870 project started from SF model, got different barrels for it but eventually i put the 20inch barrel and 7.5inch magazine extension, and other stuff:
-Choate Forearm 12 gauge model
-Ati Talon telescopic stock
-Tacstar Heat Shield
-RS magazine spring(feeds perfectly)
And thats for now, still making ideas for next setup.
Link to picture:
https://imageshack.com/i/p1468y4Yj
Sorry for typos.