Ok saber experts (me not included), do these buttons look the same to you? They do to me but I could be wrong...just trying to pin down this type of button if it was used very often during production...
Bottom one is from the hero Maul saber, top one is mine...
The dimensions look all right. The original saber buttons had female knurling and were anodized red -- are yours that? Some original buttons had a nipple in the middle, while some did not.
Master Replicas' replicas were spot-on, but all lacked the nipple. Romans Empire's replica buttons all had nipples and were spot-on except that the colour was slightly darker than the original.
I have only compared MR<->RE and RE<->original Qui-Gon Hero saber (at an exhibit) in person. Other people may have different opinions.
I just dug up a couple of images of the Obi-wans from MR and the knurling looks deeper to me, especially noticeable from the top circumference of the MR where the knurling sticks out even on the top edge. Also the base should be flat I think, not like the Obi-wan MR AOTC LE (see comp below). It looks almost like they just applied knurling to something similar, but I could be wrong.
Mine's resin, but I also think the Maul at Celebration II was all resin?
The red buttons are hydro line caps, the sort the come on the fittings of all F-15 hydro parts from either the manufacturer or depot to keep hydro fluid in or f.o.d. out of lines and components as they are shipped to wherever they need to go. Back before I came to hate Star Wars, when I was working on my own lightsabers I found and "appropriated" handfuls of those caps from the hydroshop at the base I'm stationed at.