Comcast is a big owner of NBC, and a cable service giant in the United States. Being leftie owned, it is refusing advertisements from firearms manufacturers as a matter of policy. Looking for self consistency from them would be futile. They will continue to pump ads for more dangerous things into people’s homes, and programming containing gratuitous violence of all kinds including that involving firearms.
It is noteworthy that firearms manufacturers are selling guns faster than they can make them, so perhaps advertising is less crucial than in the past. This step by Comcast might not be as significant as they think it is.
Still it is worthwhile for Second Amendment supporters to consider boycotting Comcast, changing cable providers, going to internet sources of entertainment, getting satellite or DSL as an internet provider, etc.