From their video description on YouTube:
GSL Technology has been manufacturing suppressors since 1993. With over 25 years of industry experience, our customers expect quality that is unsurpassed by any other manufacturer. Our facility is ISO-9001:2015 Certified, making GSL Technology one of the only suppressor companies in the country to have such certification. Our products go through the most stringent testing and quality control inspections before leaving our facility, ensuring that our customers are receiving a flawless product at our Class III dealerships. In addition, we also offer lifetime warranties on most products in case there are any manufacturing defects because we believe in our products and stand by our values. We are innovators, not imitators.