Here's a little DIY on my DE M56A. Firstly, there was no top rail for optics, so I had to remedy that my filing down the rear sight so I had some purchase to put a slightly longer screw in as theres no play at all on the upper receiver. A little keying and some epoxy, 1 very short screw and a slightly longer one into the rear sight.
Second, I added the cartridge holder.. being a cheap b*****d I bought some 20mm pipe clips for a quid and with my trusty epoxy, a little sawing and some short screws.. voila, a shotgun cartridge holder. (Note the foregrip isn't attached yet)
Third, this was a stroke of luck, a friend of mine asked me to order him a M56DL, it arrived damaged (snapped at the stock), so I was issued a refund, the driver inspected it and let me keep the bits. So I now have a new stock, I had to saw down the inner plastic retainer tube and sand it flush to the inner handle so the buffer tube sat perfect and held it in place tight.
The next mod will be to add the lower rail for the angled foregrip (pictured above), I'm just waiting for my very cheap alloy weaver rail to arrive from China. The torches at the front will be removed when the right clamp arrives from China.. good old China.. and their month waiting times.
At the end of the day, I wanted a Short shotgun with a stock, and that's what I've got, I'm chuffed with it and I'll be using it tomorrow (15/12/13) for the first time.. It's a good job I have 20+ cartridges, they don't last long in tri-shots.
I've repaired the M56DL with the old rifle style stock, its very long now, I'm gonna mod the sh*t out of it when I acquire some more bits and bobs. I might rough it up and go for the vintage look.. who knows. Cheers, any questions on how to's the just ask and I'll explain the best I can.