HK Roller Retainer Pin, Clamping Sleeve- New Style
This part works with all roller retainer plates and springs. HK started this change of roller retainer pins starting in all 2011-produced bolt heads. Works with all styles of roller retainer plates or springs.
- 1st gen oval-shaped plate-style roller retainer plate.
- 2nd gen “S” shaped roller retainer spring.
- 3rd gen “F” style thinner roller retainer plate.
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