The G2 parts work with all Mil-Spec receiver variations. Note: Some customers have experienced function issues with the NoDAK Spud € economy € receivers. Due to tolerance design of the NDS-3 and NDS-65 receivers, we do not recommend the use of G2 parts in those models. Whether building a new rifle or upgrading your current AK, the G2 trigger group should be at the top of your list. Our trigger groups offer an improved trigger pull of 3-4 lbs. and eliminate the painful trigger slap common on other designs. All G2 components are heat treated to a 45-48C Rockwell hardness and manufactured with tough 4140 tool-grade carbon steel. A precision secondary machining process ensures perfect fit and function. The € No fumble € trigger sleeve allows you to assemble the trigger group outside the rifle and drop it in as one piece. Each piece is finished in a military grade dark black oxide. This item is marked as € TAPCO USA € and counts as 3 U.S. Sec 922R compliant parts.