Eotech sliding when hand tight

[Topperdog]

By push to the rear do you mean the portion of the rail closest to the front sight or to the buffer tube? I have mine pushed to the front sight side of the slot when tightened. It appears to shift toward the buffer tube when cycling the bolt, but maybe when shooting a mag the amount of recoil force cancels out the bolt cycling.

Towards the Buffer Tube is what I meant by towards the rear. What happens is when the rifle is fired, the whole rifle including the optics is pushed back in the direction of the butt stock or shooter, opposite of teh bullet (equal and opposite of the bullet). When the rifle comes in contact with the shoulder of the shooter, it slows and stops the rifle, but the attachments are still moving from that momentum if they are loose or do not have enough friction to hold in place, until they can meet something to stop them. If you push the optic rearward towards the buffer tube/butt stock within the 1913 rail slot, it will already be in contact with the rifle and its momentum will stop with the rifle.

[Failure2Stop]

Ahem.
Optics should be mounted with contact forward.
The optic has greater inertia on the initial recoil than at any other point in the cycle.
For greatest consistency, mount forward.

References:
Leupold
Trijicon
KAC
KnightVision (division of KAC)
US Army
USMC

[Topperdog]

You are correct, it should be pushed forward towards the muzzle. Sorry for spreading mis-information.

Sent from my KFTT using Tapatalk 2

[T2C]

Ahem.
Optics should be mounted with contact forward.
The optic has greater inertia on the initial recoil than at any other point in the cycle.
For greatest consistency, mount forward.

References:
Leupold
Trijicon
KAC
KnightVision (division of KAC)
US Army
USMC

I have seen my QD mounts move to the rear after the weapon is fired several times. What is your opinion on how it effects accuracy if the mount is pushed forward before zeroing the optic?

[Fett85]

I was able to add a couple more notches of adjustment where the eotech does not seem to move after releasing the bolt a few times, but it is one hand tight that may require two or even more leverage if I were to do one more notch. Plan on shooting it tomorrow or thursday to see if it stays put. I can tell there is more finish being compressed so being a new sight and fresh upper something seems to be breaking in possibly

[Fett85]

I have seen my QD mounts move to the rear after the weapon is fired several times. What is your opinion on how it effects accuracy if the mount is pushed forward before zeroing the optic?

Mine started to slide again....but this time it was less and was able to do 2 more clicks again on the adjustment nob where before it was as tight as I could get it. Anyone have any ideas on whether something is stretching out? There is not any deformation of the rail just some compression of the finish on the rail....bit confused here. Thanks

[gman556]

Mine started to slide again....but this time it was less and was able to do 2 more clicks again on the adjustment nob where before it was as tight as I could get it. Anyone have any ideas on whether something is stretching out? There is not any deformation of the rail just some compression of the finish on the rail....bit confused here. Thanks

I would like to hear the answer to this too. I have been contemplating getting an Eotech my self that will end up going on a new upper.

[Shao]

Ahem.
Optics should be mounted with contact forward.
The optic has greater inertia on the initial recoil than at any other point in the cycle.
For greatest consistency, mount forward.

References:
Leupold
Trijicon
KAC
KnightVision (division of KAC)
US Army
USMC

This.... I have an XPS on a Fortis REV mounted far forward and it hasn't moved a micrometer in over 1500 rounds.

[Failure2Stop]

I have seen my QD mounts move to the rear after the weapon is fired several times. What is your opinion on how it effects accuracy if the mount is pushed forward before zeroing the optic?

Insufficient tightness on the mount.
Definately not good if it's shifting.

[Fett85]

Insufficient tightness on the mount.
Definately not good if it's shifting.

Mine is TIGHT...BCM upper with 14.5 barrel and BCM comp. I would think things on my end are good to go normally. Do comps that reduce recoil make the bolt have more rearward shift on an optic making them move to the rear? Very close buddy of mine (USMC combat weapons instructor) stated that he has seen optics move to the rear from recoil, but the rifle will still be able to shoot better groups than the shooter...