Where is the heartbeat sensor for the PKP pecheneg?

Question

I use a PKP pecheneg a lot in MW3 (multiplayer) and I can't seem to find the heartbeat sensor attachment for it. Could someone help me please?

Answer 1

as you can read in this wiki, there's no Heartbeat Sensor available:

• Red Dot Sight - Unlocked at weapon level 2.
• Silencer - Unlocked at weapon level 5.
• Grip - Unlocked at weapon level 8.
• ACOG Scope - Unlocked at weapon level 11.
• Rapid Fire - Unlocked at weapon level 14.
• Heartbeat Sensor (with glitch only)
• Holographic Sight - Unlocked at weapon level 22.
• Extended Mags - Unlocked at weapon level 25.
• Thermal Scope - Unlocked at weapon level 27.

and...

The PKP Pecheneg is one of the few LMGs that can't accept the Heartbeat Sensor in Multiplayer (the PKP Pecheneg can only be seen with a Heartbeat Sensor in the Campaign mission "Return to Sender", also, that PKP Pecheneg can't be picked up).

i can't find any information about that noted "glitch" and never heard of this before - but even if this is possible, i wouldn't recommend to use this glich because of the risk of being banned...