H&K SP5K, MP5K Reverse Stretch Cocking Tube Support Spring

A great spare to have on hand as this part can become worn and be lost. The cocking tube support spring applies pressure to the cocking tube detent to enable to the detent to lock into position when the bolt carrier is in battery.

Compatible With:

• MP5K, SP5K & Reverse Stretch Style Cocking Tubes
• Zenith, AA, Omega, DT, TPM
• Clones or other custom builds

Not for use in MP5 Or 40/10, F spec cocking tube supports as they are too short