All blemished trigger modules are 100% functional. They have been rejected from our normal assembly line for various reasons such as engraving depth, tool marks, or paint blemish. None of the trigger modules sold as blemish have any type of functional defects. They have been inspected and tested to ensure the same reliability and function as our non-blemished models. Due to the discounted pricing of these units, all sales of blemished lowers are final. Quantities are very limited.