I recently bought a Supernova Tactical. Being the tactical fanatic I am, the first thing I did was start buying accessories. Of course the first is the mag extension. I bought the Nordic Components because of all of the great reviews I've read. I love it!
Only one question though. I installed the extension and clipped the spring as stated on the instructions (10-16" longer than the entire tube + extension). After finishing the install I realized that I could fit seven 2 3/4 shells into the tube. There is only about an additional half inch of movement after putting in the seventh.