I use this on my poly guns:
https://smile.amazon.com/Lucas-Pack...lucas+gun+oil&qid=1551048213&s=gateway&sr=8-5
And this on my all metal guns:
https://smile.amazon.com/Mil-Comm-T...8265&s=gateway&sprefix=mil+com,aps,146&sr=8-3
I use the same as you on my poly guns.