As I said earlier, I took both of your suggestions - I drilled out the indentations w/ 1/4" drill then used the brake hone with fine (400 grit stones) on the inside of the tube. Smooooth! The spring was still binding when using the factory follower w/ 6 rounds in the tube and I couldn`t find an extended follower locally - but I did have a metal follower from an old shotgun that fit fine - used that for now and works w/100% reliability. I`m still going to order a Scattergun Technologies extended mag tube with kit(spring and high viz follower). To replace the TacStar one.
Thanks again guys - this is a great place; need advice, just ask and ye shall receive; get info or just be social.