Todd has created a new UMG outer barrel extension which he is selling through his Shapeways shop The Plot Against The Giant:
Hi Arnie, One afternoon recently, I was trying to fit a 247mm tightbore to my G&G UMG. Of course, it’s about 20mm to long for outer barrel. I didn’t want to pay for the G&G proprietary silencer and I was having trouble finding the threaded outer barrel kit. Both of them are rare, fairly pricey and add length and weight to what is–for me–mainly a CQB gun. Enter the modern miracle of 3D printing. I took some measurements, drew up a model, uploaded it to Shapeways and ordered one. About a week later, it arrived.
http://www.shapeways.com/shops/plotting starting from less than 10USD (price is material dependent). I’ve made them available in a range of materials and colours, but I’ve only fitted the Black Strong and Flexible version, myself.
It shouldn’t cause any problems if you later decide you want to use the suppressor, but I haven’t tried one, yet. Also, I think it may well fit the DE UMG.
Cheers, Todd (The Plot Against The Giant)