Hey guys, just wondering if anyone has used one of these.

I have an 870 Super Mag that I'm considering buying one for. Here is my dilemma. I still like using this gun for geese with 3 1/2" shells so I was kind of thinking about swapping back and fourth between a 20" barrel W/ mag extension or 28" barrel with regular tube.

My question is if I drill the dimples out of the current tube will I be able to convert back to using it without extension? Seems like as long as I can get the spring compressed and the cap started it would work but I'm not completely sure.

Also, looks like I would be into it for ~230. New 7+1 870's run as low as $360. Think I should just bite the bullet and get a new gun?