RESEARCH-BASED PRODUCT FEATURE
Based on published manufacturer specifications. Gunfire Magazine has not physically tested this product for this article.
A familiar cleaner brand does not make every bottle or safety document interchangeable. Hoppe’s No. 9 Plus has a specific product identity and a safety data sheet that should remain attached to its revision date and jurisdiction.
Start with the identification section
The linked U.S. document identifies No. 9 Plus, product numbers 999, 990 and 991, and revision 8 dated February 24, 2021. Its hazard identification includes combustible liquid and the possibility of an allergic skin reaction. The separately linked Canadian sheet is revision 9 dated October 13, 2022.
Neither date means that the document is a new November 2026 product announcement. Before relying on a sheet, confirm that it corresponds to the actual labeled product and seek the supplier’s current version.
Do not copy the entire code glossary as the label
An SDS may reproduce hazard-statement definitions later in the document. Those reference definitions should not be mistaken for the complete classification of the finished mixture. The product’s identification, hazard classification and label elements need to be read together.
Our assessment is that this distinction is especially important in product reporting: an alarming list copied from the wrong section can misrepresent a chemical just as easily as omitting its warnings.
This is document reporting
Gunfire has not tested the formulation, material compatibility or cleaning performance. This article supplies no firearm-cleaning procedure, mixing advice or chemical substitution. Follow the actual label and current supplier guidance for handling and storage questions. Find more maintenance-product coverage and safety reporting.
GHS system reference graphic, not a photograph of Hoppe’s No. 9 Plus and not the product’s hazard classification. Only the applicable product label and matching SDS determine its warnings. Displayed at reduced size. Photo: Mpelletier1; CC BY-SA 3.0 Source: https://commons.wikimedia.org/wiki/File:GHS_HAZCOM_Safety_Labels.jpg License: https://creativecommons.org/licenses/by-sa/3.0 Sources checked November 2, 2026.
Sources & further reading
Sources reviewed 2026-11-02.
Prepared for Gunfire Magazine with AI assistance from the linked source material and the publication’s editorial brief. Specifications and manufacturer claims are attributed to their original sources.