Ask a gunsmith for help.
Ask for help at a gunshop
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65000 were made from 1917-1927 in 32ACP and 380ACP. http://unblinkingeye.com/Guns/Rem51/rem51.html
in google type in highpoint firearms and it will take you to the manufactors home page and then from there you can look up your models model number and it will tell you how to take it apart. its pretty easy all you gotta do is slide the slide all the way back knock out a pin then lift up and push forward and there you have it
Assuming you have a Model JS, these are low value guns- averaging $100-$115, depending on condition.
Suggested retail is $120, so actual retail would be around $100. Used, $50 to $75.
Break the glass without breaking the model.
What Model 51 pistol or a rifle and what model?
It depends on which model you have.
You need a gunsmith