[ARCHIVED THREAD] - Optic movement normal?

Posted: 2/22/2017 11:57:00 PM EDT

Quick question of optics and mounts.

I have a Aimpoint M4 in a Larue mount. Now the mount is tightened correctly and cannot be moved by hand.

However if I lock the bolt back and hand cycle a magazine worth of rounds the mount will slightly move rearward.

Is this normal behaviour?

Posted: 2/23/2017 12:01:53 AM EDT

[#1]

Check to see if there is forward/backward movement on the rail when it's not tight. There shouldn't be a lot of that either. Perhaps you should just tighten it down a little more.

Posted: 2/23/2017 12:03:38 AM EDT

[#2]

I have the same Aimpoint, but mine does not move so I doubt that is normal, especially with a larue mount.

Posted: 2/23/2017 12:04:45 AM EDT

[#3]

I had the same issue recently with a carry handle.

http://www.ar15.com/forums/t_3_118/709857_M4-A4-Carry-handle-sliding-backward----Update-.html

You just need to tighten it more.

Posted: 2/23/2017 12:16:06 AM EDT

[#4]

Topic Moved

Posted: 2/23/2017 12:40:58 AM EDT

[#5]

Tighten it down. The throw lever should be stiff to open and close. GTG

Posted: 2/23/2017 3:13:12 AM EDT

[#6]

Quote History

Quoted:
Tighten it down. The throw lever should be stiff to open and close. GTG

View Quote

I went ahead and tightened it a bit more.

Takes around 12lbs of pressure to close and some force to open. Not tool like force or anything, just decent finger strength to open.

Posted: 2/23/2017 3:44:22 AM EDT

[#7]

I tighten my LaRue mounts enough that I can still do it with my fingers, but it takes some effort. They're tight.

Posted: 3/4/2017 2:51:44 AM EDT

[#8]

Normal for LaRue, yeah.

You can tighten it to the point where it is no longer QD and I bet you'll still have the movement.

[ARCHIVED THREAD] - Optic movement normal?

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[ARCHIVED THREAD] - Optic movement normal?

[ARCHIVED THREAD] - Optic movement normal?