Database page: Cinco pistolas de Texas - The Spaghetti Western Database
A lawman is on a mission to save a corrupt town.
Seems like a couple of years earlier this one was made. We open with an Elvis style theme song in contrast to a later song in the film which is ever so serious. In fact the later song is that serious the cast looks rather bemused. But this is a serious film. Everyone acts and behaves so serious, with say the exception of one minor charactor. The problem for me when everyone more or less acts this serious, I just cannot take them serious 
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The gun shot sounds like toy guns in this typical early entry which has been done so many times, and as you have probably guessed so much better.
This sounds like a serious condition
to a degree, but did have a grin smiley after that comment:
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