How to tell if i have center feed or staggerfeed without removing the action

[thirty06]

One thing that would help us answer your question is, 1st - what caliber , what model , round or flat back action ?

[CRNA]

Not sure what you mean by "back action". Sorry for the ignorance.

[thomae]

If the top of the receiver to the rear of the ejection port is rounded, it is commonly called a "round back" action.
Conversely, if the top of the receiver to the rear of the ejection port is flat, not rounded, it is commonly called a "flat back" action.