How hard would it be to pull off a Rifle-only playthrough on a completely new file? The use of the knife and nades being allowed and until I can buy a Rifle I'd use the pistol to kill crows and such shenanigans.
If you want to make a game E-rated, make its blood green. People who got the joke: 7
Grenades won't work. Salazar is one of just two places in the game that are both non-knifeable and non-grenadeable. The other is the spiked-ceiling before the mine in 4-3 (just 1 of the 4 lights is knifeable and none of the lights is grenadeable).
(I did a minimum-shots-fired run like a month ago, so that's why I know, lol.)