In France because of insane law we had it in 7x64Brenneke, 222Rem and also a smaller one in rimfire 22Mag. Used the delayer roller bolt system of the HK G3 based on the CETME that was conceived by german Mauser designer during 2nd world war (stg45)that fled to Spain. As there is no primary extraction the chamber is cannelured so some very small part of gases "float" the case to help extraction. System was used also on HK 11 and 21 machine guns, HK G33 and french Famas. The HK 630, 770 and 940 were a bit ugly and heavy but did they shoot!
