Frog Engineering show what they did to the HK417 GBBR from VFC comparing it to previous generations and focusing on technical details and potential issues rather than shooting performance. They highlights improvements in the stock, receiver, charging handle, buffer, pistol grip, fire selector, trigger mechanism, bolt catch, valve knocker assembly, and bolt carrier. Overall, they find the M110 A1 to be a robust and well-improved version, addressing most issues found in earlier models, and highly recommend it for those seeking a 7.62 GBBR for DMR purposes.