The AR Mag Revitalization kits that we sell work.
We buy them from a military contractor. Maybe they do have "different mold lines". Do you think it is possible that there is more than one mold?
The "springs are longer". All coil springs will take a "set". After being compressed for a long period of time they will become shorter. These are made from the best materials and designed to give you a long life of top performance.
We have sold thousands of these kits without any problems. There are even people on this board that have posted that they have these parts and that they work and they are happy with them.
TAPCO is not in business to sell products that will be returned. We want our customers to be happy and feel good about their purchase. However, we do have a 30 day return policy for anyone that is not happy.
Bottom line: If you are happy spending more money on a product that will perform the same, go for it.
Life is too short to worry all the time.
Sincerely,
Buddie