Heavy tungsten handle adds mass to the bolt, allowing a factory 22 long rifle bolt to be used with a 17 HM2 barrel.
Designed to slow bolt speed down in 10/22's that have been converted to .17 Hornady Mach 2 (HM2). When using a normal bolt with a .17 HM2 the bolt action is too fast and results in jams and unsafe shooting conditions
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