Just thought I would share this with everyone. I needed a shotgun for IPSC shotgun matches in Standard division. I already had one for Standard Manual and Open. 4+1 of 2 3/4" in my 930 was not acceptable. 
After cutting a perfect size piece of solid oak doweling I got from Home Depot which allowed no more than five 3" inch shells in the tube, I put a washer then a screw into the doweling from the outside of the tube cap. I put the screw head on my table grinder and flattened it so a screw driver will not be able to take the screw out anymore then I painted it black. It worked out great.
What's amazing about the Nordic Components extensions is I didn't ruin the whole tube as you can just buy a cap that screws on and even just a longer middle tube portion in case you go to US for 3-guns.
After cutting a perfect size piece of solid oak doweling I got from Home Depot which allowed no more than five 3" inch shells in the tube, I put a washer then a screw into the doweling from the outside of the tube cap. I put the screw head on my table grinder and flattened it so a screw driver will not be able to take the screw out anymore then I painted it black. It worked out great.
What's amazing about the Nordic Components extensions is I didn't ruin the whole tube as you can just buy a cap that screws on and even just a longer middle tube portion in case you go to US for 3-guns.
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