PTR-91 Inc. rifles are all newly manufactured and are made to exacting standards and close tolerances. The PTR-91 series rifles are made to function with .308 caliber ammunition, but will function with 7.62 NATO and 7.62x51 as well. The PTR-32 series rifles are made to function with 7.62x39 caliber ammunition. For liability reasons, PTR-91 Inc. does not recommend the use of reloads or surplus ammunition. If surplus ammunition is used, beware that this ammunition varies from manufacturer to manufacturer, lot to lot, year to year, components used and processes in manufacturing. Please keep in mind that most surplus ammo is either tar sealed or lacquered finished. When firing surplus ammo, you will need to clean the rifle more than if you were shooting newly manufactured commercial ammunition.
For optimal performance and reliability, PTR-91 Inc. recommends that you keep your rifle bore and chamber clean, and well oiled.