5hawn

Did anyone ever determine if the A400 barrels fit the 1301?

FWIW, the stock spring works fine me in my +5, so you may be able to use the spring as for now.

Apparently, I have the larger mag tube threads. Nordic sent me a larger nut to replace the first one for my +5 tube and it threaded on fine. BTW, I tried the stock spring out of curiosity (with low drag follower) and it worked fine with 50 rounds of 2-3/4 1-1/8 Rios shooting fully loaded to empty each before reloading. Wish I had read about the bolt trick to pull the stock spring out. I compressed the stock spring with a plastic punch while using lock ring pliers to compress it and yank it out. There were no tabs to grind off. Still need to check POA but was throwing clays to try things out and crushing them well enough with the extra-full choke in there.

Picked up an M3000 a few months back and found this thread when looking for an extension tube. Seems I have a lot of catching up to do. MOA doesn't have the +5 tube, so is Nordic the best site to get a +5 and compatible adaptor nut? BTW, my M3000 runs flawlessly with light (sub-spec) target loads. It didn't when new, but after a box of hunting loads and a few boxes of spec target loads, it's been great. The thread has me concerned about POA/POI, so I'll have to put some slugs through it and see.