Nice post.i use a big soft cotton towel in the brass and link impact area keeps everything close by and prevents case mouth deformation for ease of reloading. also use a magnetic floor sweeper to pick up links.
links are pretty easy to get. im up to about 8000 links atm.
my m249s is not ammo sensitive runs 40grain varmint to 77grain match ammo no issues.
i did not use the mag it came with. i have used pmags, milsurp metal mags, and pmag drums. none show any signs of feed lip wear. the d60 drums are a perfect match for this gun and it will not work with beta c mags.
i use ewl2000 that stays wet through at least 1000 rounds. ive tried the battleborn i prefer the ewl2000.
but mac reaction is pretty much my teaction shooting this gun. it does not get old and its a beast.
ive got about 1200 rounds throught it with no gun induced malfunctions. only stoppage was one brass cased federal 55grain with not enough powder to cycle the action. bullet hit the ground about 50yds in front of the gun and was definately subsonic. we thought we got a baffle strike at first from the woerd unexpected sound.
it runs everything just fine with a surefire fa762k attached.
here is my wife shooting 55grain wolf with the fa762k. the loud pops are the bullets hitting a steel goat. we use a big cloth painter tarp for grass shooting.
im not concerned about spare parts as fn support is pretty good and i should be able to get what is needed from them if the need arises