can you use this all over insides of the pistol or just the barrel?

Same as others. Metal parts for sure. I have had limited contact with polymer portions as well without any sign of softening or otherwise affecting it. As others have said I always follow up with a clean dry patch for the barrel, and a rag for other parts.

Will this remove copper as well?

I assume you're talking about copper plated bullets yes it will remove the fouling of copper with a copper brush or brass

Can this be used on any plastic parts that in my Ruger 10/22 rifle?

I have not used it on plastic parts. I think you should contact the manufacturer about this. The solvent seems extremely powerful when I have used it in the bore of my Winchester Model 70 Featherweight. I wouldn't think it would be suitable for plastic, but I'd say you should ask both Ruger and Hoppe's.

ASIN	B000JMLUC6
Batteries included?	No
Best Sellers Rank	528,037 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 45 in Paint Thinners & Solvents (Home & Kitchen)
Brand	HOPPE'S
Color	White
Customer Reviews	4.8 4.8 out of 5 stars (10,196)
Date First Available	6 Aug. 2012
Department	Boys'
Hand orientation	Ambidextrous
Height	7 inches
Included components	Solvent Hoppe's No. 9 US
Is discontinued by manufacturer	No
Item display length	2.5 inches
Item display width	2.5 inches
Item model number	916
Manufacturer	kyriee
Material type	Aluminium
Product Dimensions	6.35 x 6.35 x 17.78 cm; 299 g
Weight	408 g

kyriee Hoppe's No. 9 Solvent, 1 Pint Bottle E/F

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