EDIT: Apparently its not recommended to put it on a 308.  With that said what would be the ideal way to mount it to a 5.56 DMR similar to the one below, just in 5.56 instead of 308.
https://www.ar15.com/forums/industry/PVS_14andapos_s_on__308andapos_s_or_Higher_/209-209441/

I would like to do some long range night time target shoot/hunting with my 308 AR. I know the ideal method is to purchase a dedicated thermal/NV scope but thats not in the budget right now. I would like to use what i have which is a PVS-14 (Normally helmet mounted).

Is it best to mount it infront of or behind the rifle scope?

What mount would you recommend?

Thanks?

Picture of rifle


This is the only option i could find for mountingt it behind the scope. i think i would still have to move the scope forward some.
https://tnvc.com/shop/usgi-pvs-14-weapon-mount/

This might be a good option for mounting it infront of the scope. The adustable height would be nice.
https://tnvc.com/shop/m-69-pvs-14-adjustable-weapon-mount/

This would work as well.
https://tnvc.com/shop/tnvc-tm14-mk2-pvs-14-weapon-mount/

A PVS-14 is definitely not rated nor recommended for a .308! Too much recoil, and will ruin the 14!  

Did you mean a PVS-30?

Even on a semi-auto with a suppressor/break?

If you're dead set on using a PVS-14 on a .308, look into a recoil compensated tube. Rated to actually handle a .308 rifle. Nifty concept. Tube has a built-in accelerometer that detects recoil and shuts down the power supply to prevent damage.

Pick up a PVS 4 and be safe not sorry. They're reasonably priced and bulky but solid as a tank and will stand to most any recoil from any rifle.

Especially on a semi-auto w/ a brake.  Heavy BCGs slamming into battery create a different sort of forward recoil impulse that can be really hard on things.  Brakes have a similar effect, albeit very transient.  No PVS-14 that I am aware of is rated (tube AND housing) for 308 recoil except the PVS-14RC.  That being said, many, MANY people have mounted their 14 on 308 class weapons w/o problems.  Many factors play into whether or not an individual system winds up w/ recoil issues.  I have opted not to exceed mfr specs since it is a risk I just don't care to take short of a life and death situation.

I have fired my large frame AR at night by simply looking through the optic w/ my NightCap mounted 14.  This takes practice to get proficient with, especially if the optic has adjustable parallax.  Even with practice, it is horribly uncomfortable from certain positions, particularly prone on flat ground.  If this is the route you plan on going, that adjustable stock is going to be your friend.  Optics that have a large eye relief RANGE are much better-suited for this application that ones that don't.  My procedure for setting up a gun for this was to first adjust the stock to no further than the second to last position, then mount the scope as far FORWARD as possible within it's eye relief range at max power.  When you have it where you want it, rotate through the magnification range to make sure you are still getting full FOV regardless of magnification.  This guarantees that you are maximizing the amount of clearance for your 14 while still giving you the best chance of getting a good image.  When shooting in the day time, try to run the stock no further out than second to last position.  At night, if needed, you can add additional clearance by moving the stock further out.  An add-on buttpad helps with this too and has the side benefit of making a gun even more comfortable to shoot.  You will also need a good IR illuminator to effectively do this, preferably one with variable beam focus to avoid IR splash off the ground when shooting prone.

I mostly use an IR laser for shooting, but small/distant shots typically require more precision than a laser offers.  Usually longer shots also allow for a little more time so that is when I would flip the 14 to my right eye and actually get behind the gun.  Worked pretty well for a long time, then I bought a clip-on.  There is no comparison, image-wise, but there is something to be said for a cost effective solution.

Old thread but no one else brings up the Hyper housing.  It seems to mitigate recoil.  I know there's an RC tube rated for Scar 17 with regular housing.

Anyone think the Hyper housing cam handle a regular tube and 308?

M107 requires optics and electro-optics rated at 4000G IIRC. There's a standard for it.

M4 has some nasty shocks, but generally doesn't exceed 500G's. The M4 is a little on the light side so might exceed this level.

The harmonics chart seems strange to me. Even if you recalculate for mass of the rifle and assume the shock-bearing mass is completely homogenous, the M107 should still have more than 50% more weapon shock peak acceleration than the M4, and that's a best-case example.  Where did that chart come from?

However, specific shocks may be further concentrated in particular areas due to material selection and the speed of sound in aluminium and like alloys is much higher than in steel.

David.

An interesting video here showing the shock moving through the rifle. It's interesting how the greater shocks occur when metal strikes metal.

https://vimeo.com/112328340

David

You're best bet is to never weapon mount a PVS-14 at all. They are not designed for it. Why risk destroying an expensive unit?