If you have an MCX stop shooting it
The MCX is sexy, and, in extremely rare instances, a condition may exist causing an unintended discharge…
Sig wants to upgrade the carriage assembly to include one with a firing pin lock as well as a slightly redesigned op rod and bolt.
Apparently: “SIG has found through extensive factory testing that in extremely rare instances, not reported in the field and extremely difficult to replicate, a condition may exist causing an unintended discharge.”
If you have one, contact SIG to arrange to get that new assembly (postage paid) and a $50 voucher for SIG swag.