Pegar un tiro

Pegar un tiro
 

Can someone translate what is said in this video at: 3:10

https://www.youtube.com/watch?v=918PUzuhzxs

I know he uses the construct "pegar un tiro"... what exactly does that mean? Does it mean "put a bullet in you both"? "[first part] pega un tiro los dos"?

"Pegarle un tiro a alguien" = to shoot someone

His accent is hard. He says "yo no sé si pega'le (pegarles) un tiro a lo' (los) do' (dos) o meterme un tiro en la cabeza --"I don't know if I should shoot you both or put a bullet through my head."