Airforce Airforce Texan breech questions

I bought a .510 Texan CF in February exactly 30 days later the breech froze up on me I couldn’t get the bottle off to actually remove the breach because it was stuck all the way shut so I contacted Air Force and instead of fixing it they just sent me a new one.
My question is on the original Texan. I could see two screws in the breach when it was closed I could only see about half of them though.
On this new one, I cannot see the screws at all. Did they change this or is there something wrong with this gun?

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