Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Meprolight Walther P99, S&W 99 Tru-Dot Night Sight - 9mm & .40 - Rear Sight Only
Product description: All of Meprolight's products undergo meticulous quality assurance according to international standards. The company is certified to ISO-9001:2008, ISO-14001:2004 and OHSAS 18001:2007, complying with NATO and US military specifications and International MIL Standards. State-of-the-art technology combined with high reliability and simplicity of use have made Meprolight the vendor of choice among military forces, law enforcement agencies, defense agencies and weapon manufacturers.
Product feature: Unequaled low light performance, Brightest night sights available today, Used by Military&Law Enforcement
Product price: $51.34
Product brand: Meprolight
Target attributes: Firing Action
Answer: attribute: firing action
value: None
source: None