Example sentences from the web:

• You must admire the way she sticks to her guns. She is not easy to persuade.
• I’ll stick to my guns on this matter. I’m sure I’m right.
• The people of the community stuck to their guns and marched in protests.

ORIGIN OF THIS IDIOM …

This expression originated at a time when guns were becoming the weapon of choice in warfare.
“Stick to your guns” was a command given to sailors manning the guns, on military boats. They were to stay at their posts even when the boat was being attacked by enemies.

Stick to your guns – Bon Jovi

So you want to be a cowboy
Well you know it’s more that just a ride
Guess you got to know the real thing
If you want to know the other side
Ain’t nobody riding shotgun
In this world tonight

And when you spit, you better mean it
You got to make ’em all believe it
If you’re gonna be the one

Stick to your guns
Ain’t nobody gonna hurt you, baby
You can go for the trigger
But only if you have to
Aim from the heart
Some will love and some will curse you, baby,
And you can go to war
But only if you have to
It’s only if you have to

So you want to be the big time
Some people have to drag you down
There’s no living in the backseat
If you’re gonna drive through town
And when you pray for independence
Boy, you better stand your ground

You got to give it all you got now
Or you might get shot down
Fight hard until the battle is won

Stick to your guns
Ain’t nobody gonna hurt you, baby, 
You can go for the trigger
But only if you have to
Aim from the heart
Some will love and some will curse you, baby,
And you can go to war
But only if you have to
But only if you have to

Solo

Well, you know that I been through it
I got the scars to prove it
Fight hard and the Battle is yours

Stick to your guns
Ain’t nobody gonna hurt you, baby
You can go for the trigger
But only if you have to
Aim from the heart
Some will love and some will curse you, baby,
And you can go to war
But only if you have to
It’s only if you have to

But stick to your guns