I have one, Tried to order the Hk factory mag extension but had to wait weeks and weeks only to be told their limited stock made them diffuclt to get ( as per my supplier ) . So I'm going to try Choate- they said their own version is readily available. Tried to get a Surefire foregrip / light combo like the 870 guys use but Surefire said they have no plans to produce them. I'm now looking for a universal tac sling but that looks like a project too. Tried also looking for a FP6 shotshell side saddle but more of the same. I do like this gun though. Its fiber optic type of true glow sights work great. The gun is very balanced and smooth. The best part is that hardly anyone has one that I've seen in person. Actually I've never seen anyone elses at the range which is cool in my books -- like to be different. The gun is well built and reliable from all I've read and experienced. As far as the quest for bolt ons -- Thats exactly how I look at it . Gives me something to do, and when I either find what I want or make it work through an adapter it will be unique. If your looking for a gun thats got a million parts available then the 870 is where its at.