LMR27 magazine reload speed bug
The reload speed as written in the UI is the same for the 15 round mag and 15 round fast mag - as seen in the pictures, might be the same for the 20 round mags, I dont know yet.
Ideas
I noticed this today as well when trying to build out my weapon, I went with the mag catch attachment because I wasn't sure if the fast magazine was actually helping or not.
On the subject of the magazine... Generally speaking The LMR27 seems to be a particularly weak option compared to other weapons in the game. A subtle way to buff the weapon may be to reduce the points needed for 15+ round magazines, and/or adjusting the headshot multiplier
Yeah, this weapon is very underwhelming, never seen anyone use it. Same goes for the pistols, especially the 5.7