If your Ranger is a bolt action 22, it is likely a Marlin Model 81 made for Sears, and wearing their brand name.
Step 1- open the bolt, and check that there is NO ammunition in the rifle. Do that twice. Then open the bolt, depress and hold trigger, and slide bolt out of the rifle.
Step 2- Remove the large screw on the underside of the stock. You can now lift the action from the stock. The inner magazine tube can be turned, and withdrawn from the outer magazine tube.
STOP. Do not disassemble the rifle further.
What Model 51 pistol or a rifle and what model?
It depends on which model you have.
How to break down a model 120 or a 140 same as a 1200 or 1500 http://books.google.com/books?id=zRJm6uF7TSIC&pg=PA538&lpg=PA538&dq=THE+WINCHESTER+MODEL+120&source=bl&ots=T-yjfR-FgY&sig=B6_I2ozM1We8WP65r99vZxyQZ90&hl=en&ei=lu1jSsuxL9y_twex4Yn9Dw&sa=X&oi=book_result&ct=result&resnum=1
o You need to find a gunsmith
You need a gunsmith
Ask a gunsmith for assistance.
Ask for help at a gunshop
Take it to a gunsmith
Best to get help from a qualified gunsmith.
Best to ask a gunsmith for help.
Recommend you ask a gunsmith for assistance.
Ask a gunsmith for help.