Tikka T3X to AICS mag conversion

None of them are drop in
I use the Atlasworx one. Works fine.

Depends on your intended usage but....

Honestly I'd stick with the Tikkas mags. You aren't giving up a thing except overall length potential with the longer bullets. There are a couple manufacturers making enhanced factory style tikka mags as well to allow loading longer.

Don't fall for the metal dbm will make your groups better sales pitch either, cus it won't. The only thing that will make your tikka shoot better is working up a good handload for it and putting on a high quality cut rifled tube.
 
+1 for Waters mags.

I’ve had a couple of 223 setups using the 10-round long OAL mags and they’ve all been superb. Unbelievably quick shipping from AUS as well.