PTR sells products chambered for multiple calibers. Nomenclature of cartridges can be confusing. It is vital that you understand cartridge nomenclatureand only fire cartridges for which your purchased firearm was designed. To assist you, the name of the appropriate cartridge will be stamped on the receiver. If you have any questions regarding the appropriate caliber cartridge for your product please contact PTR prior to firing!
Please remember, PTR recommends the use of original, high quality commercially manufactured ammunition in good condition. PTR will not honor claims which may result from careless or improper handling, unauthorized adjustments, unauthorized parts replacement, corrosion, neglect, or the use of the wrong type or caliber of ammunition.
Due to the nature of the delayed blowback roller-lock system - specifically the extraction process and its resulting damage to the casing; PTR does not suggest, recommend, or support the reloading of any cartridge fired from a PTR product.
NOTE: Some types/brands of ammunition have unique characteristics that reduce liability in semi-automatic firearms. PTR strongly recommends that you purchase and test a small quantity of any type of ammunition in your firearm prior to purchasing any particular item in large quantities.