I have owned my S2K for 2 months and have fired 1,200+ rounds. 300 rounds factory unmodified and 900 rounds after "Full MCARBO" (every MCARBO modification except the sling mount). No FTF, FTE, light strikes or broken charging handles. I drop tested it from 5’ and it passed. Have run 5 different types of ammo both range and defensive with no hiccups. I haven’t run any cheap Russian ammo because my range doesn’t allow it.
I have never replaced so many components in any of my guns and find it remarkable that it runs as well as the factory version. I think the notched rear sight is a little too tall but other than that, the upgrades are perfect. Kudos to Chris and M*CARBO!
What has your experience been?