From innovative products like the ERGO Grip and F93 Pro Stock ERGO Grips has expanded their product line to include a wide range of precision engineered weapon accessories. All ERGO products are manufactured in the USA to the highest standards and tightest tolerances and all shipments of ERGO products are backed by their comprehensive satisfaction guarantee. If a product fails to meet or exceed customer expectations ERGO will replace the product or provide a full refund regardless of where the product was purchased. Features Reconfigures the squared shape of the AR/M4 magazine well into an ergonomic and comfortable grip option Gives AR/M4 receivers a distinctive aesthetic upgrade Easy installation Oil and solvent resistant Santoprene construction NTOA Recommended