MSP and DW,
Thanks for the input. I had a chance to try one of the Win-Brn-Moss style of a friend who has a Moss pump. He thought he bought it as a Carlson at one of the Farm-Fleet stores. It threaded in fine in my NEF, the only thing is it went down so far (it was a flush tube) that it left better than 1/8 inch of the barrel up past the top of the tube. My fear was that you could accidentally bang the end of the barrel and basically "Lock" the tube in....kinda like pinging the edge over on top of the tube edge. It fits just a tad inside of the barrel on his Moss...so maybe my NEF is cut deep?
So I think I would like to know which of any style of extender tube any one on the forum has tried, as that makes me a little shy of the flush style. Has anyone else noticed the flush style going in too far? How many Manufacturers make the Win-Brn-Moss style?
Also that brings to mind...what if an extender bottoms out on the top outside of the barrel but does not meet the matching recess inside...leaving a gap. What should the cut depth be on a choke tube system for the NEF....anyone measure? (I know it does not look easy to take that measurement.)