Must have upgrade for all HK owners. Our Action 3 roller retainer spring upgrade spring for all 1st Generation bolt heads (replaces the oval shaped roller retainer plate). The roller retainer plate is one of the most common replacement or breakage parts and is found on the older HK style bolt heads. HK made a wire spring as an upgrade for later production bolt heads to improve longevity of this part. We now offer a roller retainer spring that is 100% retrofit-able to the old style bolt heads found on all the following:Drop in upgrade for the following HK rifles or pistols:
- HK91, G3, PTR91, C308 & Cetme
- HK93, 33, 53
- HK94, MP5
- SP-89, MP5K
- All Zenith and POF models
- Any HK or clone that uses the older plate style roller retainer plate (oval shaped)
This upgraded part will improve the life of the roller retainer and reduce the amount of times you have to replace the roller retainer. Always replace the roller retainer pin when replacing the roller retainer spring.