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.

Item Package Dimensions L x W x H	6.85 x 2.56 x 2.56 inches
Package Weight	0.45 Kilograms
Item Dimensions LxWxH	2.5 x 2.5 x 7 inches
Item Weight	299 Grams
Brand Name	Hoppe's
Country of Origin	United States
Model Name	916-HOP
Material	Other
Suggested Users	mens
Number of Items	1
Manufacturer	Hoppe's
Part Number	916
Style	16 oz
Included Components	Hoppe's No. 9 Gun Bore Cleaner, 16 oz. Bottle (packaging may vary)
Size	1-pint
Sport Type	Hunting

Hoppe's No. 9 Gun Bore Cleaner

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