Excellent article. In the couple years we ran action shoots with no affiliation to IPSC or USPSA I saw terrible shooters transformed into pretty good with a then $4K race gun.
So out of the box concealed carry is the intent.
Depending on the match and participation if there are slots open shooting it for fun/no score with an illegal gun or sights should be up to the officials. If there's no safety issue and funds go to the club why not?