u/spacenavy90

▲ 6 r/gunsmithing+1 crossposts

Acquired an Aimpoint CompM (original, not CompM2); missing the battery cap. Help?

Hello, I acquired an Aimpoint CompM at a military surplus store and was trying to locate a battery cap to replace the missing one. I ordered a CompM2 battery cap in hopes that they were the same threads but they are not.

I've tried locating a replacement cap elsewhere online but haven't had luck.

I had a couple questions:

  1. Is the battery cap a requirement for the sight to function? I have tried using a CR1/3N battery to test if the device even functions but with no luck. So I'm trying to determine if either the sight is malfunctional or if the electrical signal needs the cap somehow to complete the circuit.
  2. Is there somewhere to acquire a replacement cap for the CompM specifically? If not is there anything DIY that can be done to resolve my issue?

Thanks!

Update: Yes the cap is a requirement, it completes the circuit. I was able to use a small piece of wire to complete the circuit as a test and confirmed the optic works. Right after posting this I checked ebay again and found a replacement cap for sale so I'm in luck! For anyone who finds this in the future through Google or something, the CompM2 windage caps threads do match for the original CompM or ML, but the battery cap for the M2 does not!

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u/spacenavy90 — 14 hours ago