With everyone getting into AR maintenance and gunsmithing work these days, the first problem encountered is the little spring or detent that pops out only to fall into that black hole under the workbench where you can't find it! This Parts Kit - of all the most critical springs, detents, inserts and pins will get your weapon back to full function in short order. Kit Includes: 4 Takedown Pin Detents 4 Takedown Pin Detent Springs 2 Buffer Retainers 2 Buffer Retainer Springs 2 Firing Pin Retaining Pins 2 Safety Detents 2 Safety Detent Springs 2 Extractor Spring Inserts 2 Extractor Springs