It will feed fine with factory mags and AICS mags. I never tried a CTR mag or bottom metal but all tikkas are long action, spacers and bolt stop are all that change from SA to LA in a factory bottom metal.
Tikka’s are pretty forgiving on feeding with factory mags but if for some reason it doesn’t feed well with the longer mag and shorter 127’s just keep the M+ magazine with the spacer to feed them.