You are referring to the “gas block journal”. Yes it cuts weight not having it. Some non-ported rifles have been ordered without the journal. X-caliber, you don’t get the option of no journal. So it depends of what company you order the barrel from.Curiosity, do the light weight (non ported barrels still have the bulge in the middle they just do not drill the port? Or are they thinner full length and not port and thierfor lighter?
If they have no bulge and are lighter and you save the $50 (after shipping) of the Samson gas block, you could possibly spend the same $ but get a slightly lighter setup.
(You would just lose the option of turning it into a gasser at a later date.)
Please educate me as I have ever seen an ar barrel that was not ported.