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I hardly ever post in the forums (other than the classifieds) but found your post so ironic that I'm compelled to get off of my posterior. After surfing the various shotgun pics on this and other sites for several months, I had also become interested in the idea of cutting one of these down. I was planning on a Model 11, but while looking around, came across a great deal on an A5 in really good shape. Went looking for a damaged barrel to cut up and ended up with two. I'm also looking at a Nordic +1 but possibly a sling adapter mag cap vs the Scattergun Tech approach. I really like the engraving idea, and may borrow that if I can find someone who can put it there. Please do post pics when you are complete. I am getting ready to do my paperwork so am probably a couple of months from completion.
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Once it is done I will post some pics. I am waiting for my Form 1, then sending my barrel to Rose Action Sports. He is going to cut the barrel down, thread it for chokes, and install a new front sight base and bead.
I went with the Scattergun sling adapter to fill in a gap between the endcap and the handguard. The threads on the Model 11 are a little longer than the 870 it was designed for. The endcap runs out of threads before it is tight on the handguard. After I got it installed I figured out that the mag extension screws out of the endcap. I actually may have been able to use it without the adapter but I haven't tried it yet. If you'd like I could give it a shot and see if it would work without the sling adapter plate.
The engraving was done with a laser engraver. A local machine shop just got into building their own AR15s. They use the same engraver to mark their uppers and lowers. It is able to reach the depth requirements that the ATF specify. A lot of jewelry shops have engravers similar, but cannot reach the required depths. This place may would do your receiver through the mail since they are an FFL. If you' like I can get you their contact info.