I finished my MKM build and finally got to shoot it last weekend. It's a Mega Key Mod Monolithic with a Lilja 20" 1:8T SS barrel with a JP comp on it. I run a Geiselle SD-E trigger and have two stock set ups for it the ACS-L in the pics and a PRS with monopod for long range prone. It has a Vortex Viper PST 6-24x50 FFP on it in an ADM Recon mount. I loaded up some break in rounds with 140 SMK's over 4831SC in new Remington brass with BR-2 primers and put 100 rounds through it. My 10 shot string chronoed 2820 FPS with an SD of 18. My best group was under .5 at 100. I only had 140 yards max to shoot and were shooting 3" steel plates. It was too easy...every shot connects. Hope to get her out to 1k soon. I now have four AR10's so one or two are going to have to go. I'll be shooting this all summer!
