HK Factory German factory spring that is used in conjunction with the MP5F, MP5 40/10 cocking tube support & cocking handle. One of these springs is required for use with the cocking handle/support assembly. You need the following: MP5 40 Cocking tube support, MP5 40 cocking handle, & the cocking handle spring to make up an assembly.
- MP5 F (must be factory correct with the F style cocking tube assembly installed)
- MP5 .40 Cal
- MP5 10MM
- MP5. 357 Sig
- MP5 9X25mm