Mounted the DSF-870 today on a tactical 870. I'm sure this means I can take on the zombies now. It has a Speedfeed stock with four extra rounds, GG&G rear QD sling swivel plate, DSF-870, and a Magpul magazine clamp with sling loop. The breaching choke has been smoothed a bit so it won't catch on a weapon bag interior.

I like that Surefire

I purchased it from a very reputable member of an incredibly informative firearms forum. You would be challenged to find a forum with more trustworthy people who treat members with respect.