We offer engraving services to help you comply with federal, state and local regulations for gun manufacturing. We offer polymer 80 engraving with any information you provide. Our team of firearm experts recommends engraving your name/entity/trust, the city & state, the model of the firearm, the caliber, and the serial number you assign. You can purchase your 80% lower from us and have it engraved before shipping. Another option is to send yours to us for our 80% lower engraving service. Any polymer 80 serial number engraving you have us engrave must be an unmodified lower. We also offer magwell and glock frame engraving. Take a look at the options available and feel free to call us with any questions. RTBA is here to help!