For the record, I installed my Willson Combat mag springs and followers last night.
The #19 kit, a mag spring and follower for $4.95, needs two points of info for potential buyers:
1) This kit is intended for 7 rd magazines only. If you have an 8rd shooting star mag, it works just fine, but, you will end up with a 7rd mag. This was a fine trade off for me as I only had one 8rd shooting star mag, and I figgure it is better for me to train with 7rd mags exclusivly so I trian the way I will shoot in combat.(IE it would suck to forget if I was on my 8rd mag or other 4 7rd mags)
2) The plastic followers are injection mold designs. So, if you look at the underside of the followers, you should see a small circle from where the plastic is injected. If you don't see an almost flat circle, but you do see a rod/tube/tail that is standing out of the follower, you need to trim it off. If you don't, it binds on the spring as the spring compresses and will keep you from fitting all your rds in the mag. I suggest a small pocket knife for the job.
Now, Willson Combat does sell a spring a follower kit (#266,45C) for $7.95 each which will convert your standard 7rd mags over to 8rd. I have not purchased these, but Mr. MadDog did so perhaps he will fill us in on them.
Wes