Jordan, you should consider posting this in the "General Parker Discussions" section.  Folks might not be checking here that could answer your questions better than I. 
 
There are both F and P grades.  Gauge is not always stamped on the gun.  If you can post a good picture of the stampings on the barrels, that could clear up a lot of your questions.  I'm sure someone has the knowledge of replacing beads that can help you. 
 
Again, try posting your pictures and questions in the General Parker Discussions.
		 
		
		
		
		
		
		
			
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				"Doubtless the good Lord could have made a better game bird than bobwhite, and better country to hunt him in...but equally doubtless, he never did." -- Guy de la Valdene (from A Handful of Feathers ) 
 
"'I promise you,' he said, 'on my word of honor, I won't die on the opening of the bird season.'" -- Robert Ruark (from The Old Man and the Boy)
			 
		
		
		
		
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