Most markers can have the anodizing removed from them between 1-3 times without fear of damage to the marker. The main thing you will need to concern yourself with are any threads in the part you are stripping. Threads have a very low tolerance and when you remove anodzing you actually remove material from the part you are stripping. When done properly you should be removing somwhere between .0003 and .0005. This allows you to remove the ano at least 1-3 times before getting into a area that will remove enough material that will not allow the threads to hold.
When you re-anodize the part you should have a growth of .0002 to .001. This is a level 2 anodizing grade. This is what most people will be able to achieve with a home setup. As you can see you effectively replace about 2/3's of the material that you remove.
I have personally reanodized my Gen 5 Bushmaster 4 times now and have not had any ill effects from it. It all depends on how you remove the anodizing.
My setup for anodizing removal is 3 Gallons of very warm water, not so hot you cant put your hands in it. I then use Lye, about a half cup.
I suspend the item I am and stripping in the middle of the solution and check it about every 60 seconds.
By using warm water you increase the reaction of the Lye with the anodizing. If you use cool water the process will take longer.
I periodically remove the part and wipe off all loose ano and dip the part back into the tank to remove any ano that has not been released from the part.
A bushmaster body can be stripped in about 2-3 minutes to nothing but silver.
None of tags appear to work so here is a link to a pic of my bushy body that has been stripped.