Evo bipod issues

[praveen]

Hey guys,
I'm hoping to get some info on the EVO bipod from tier-one.
I bought the aluminum version in 2017 from Osprey rifles(UK). Osprey doesn't seem to exist. At least I couldn't find their site.

The bipod worked fine initially but in one of the matches, its main pivot pin came out. I was lucky to have seen it in grass. So I put it back in and since then I've been holding it in place with a couple of pieces of tape on both sides of it. I'll attach a pic to explain what I mean.

Now, in a match recently, it stopped locking. Even after tightening both the thumb screws, I am able to rotate the wheel and change its width.

So, any suggestions on what to do? I generally like the bipod but I can't shoot with it in this state.

One thing that could be helpful is if somebody could measure and send me the exact diameter of the pivot pin. I could get it made for I think mine is somewhat thinner than is required.
Mine measures 0.237" in diameter and 1.590" in length.

I've attached some pics to show the location of the pivot pin and showing how it comes out.

 

[TAJ45]

Not knowing if built to metric or SAE, your measurement is 6.0198mm so a .250 pin? That would be a lot of clearance.

Not sure about the design so no help on the tightening.
Can you disassemble and look for stripped threads?

 

[praveen]

Not knowing if built to metric or SAE, your measurement is 6.0198mm so a .250 pin? That would be a lot of clearance.

Not sure about the design so no help on the tightening.
Can you disassemble and look for stripped threads?

6.0198 is correct... but I'm not sure what you meant by a .250 pin. It surely has a lot of clearance and some other EVOs I've seen don't have this issue. I suppose I should start by getting a slightly fatter pin and trying it out.

The threads don't seem to be stripped. However, I'm not entirely certain how the design works. When the thumb screw tightens, the force is applied perpendicular to the direction in which legs are moving. So, how do they remain tightened? I'll look some more. Stripping the bipod didn't reveal any good info. I'll see if I can increase the pressure by adding a washer on the thumb screw. Doubt it though.

 

[Monte F]

https://tier-one-usa.com/pages/contact-us
I would contact them at the above website. I can try to measure mine if not too hard to take apart.

 

[TAJ45]

The .250 pin would be a 1/4" dowel a pin. I omitted the (") .

 

[Laurie]

I'm hoping to get some info on the EVO bipod from tier-one.
I bought the aluminum version in 2017 from Osprey rifles(UK). Osprey doesn't seem to exist. At least I couldn't find their site.

Stuart is still around but his outfit is now called GS Precision. He is in partnership with Gary Costello the owner of March Scopes UK, hence 'GS'.

https://www.facebook.com/gsprecision/

EVO Leisure / Tier-One's home contact point is:

https://tier-one.eu/pages/contact-us

They're an excellent outfit and very helpful. They close down for the Christmas / New Year break sometime this week though.

 

[praveen]

Thanks Laurie, Monte, Taj. I'll contact tier-one. I had sent them a message through their website few days ago but didn't get a reply. Looks like another ping is needed.

 

[butchlambert]

That is 6mm not .250.

 

[TAJ45]

That is 6mm not .250.

I realized that butch. He said it was loose, not knowing whether it was metric or SAE, I went to the larger, standard size. That being .250.

 

[butchlambert]

I realized that butch. He said it was loose, not knowing whether it was metric or SAE, I went to the larger, standard size. That being .250.

Wasn't trying to step on your toes. +.013" is quite a difference though.
You can try a b, c, or d drill. .238. .242, or .246.

 

[TAJ45]

Yes it is way large. Hard to tell how loose is "loose". We can only guess what may have accidentally during mfrg.
It will be interesting to hear how this percolates when mfr communicates.

 

[Crosshair1]

Ive had similar issues with same bipod, I used some high strength stud lock on the pin and it hasnt moved in 2 years.
The pin should only be fixed to the eye thats part of the height wheel adjustment.
Ive seen some replaced with a 6mm bolt and nyloc nut, seems to work.
The best solution to the locking is to replace the thumbscrews with m6x30mm clamping levers and stainless washers, it will not move once they are tightened

 

[praveen]

Ive had similar issues with same bipod, I used some high strength stud lock on the pin and it hasnt moved in 2 years.
The pin should only be fixed to the eye thats part of the height wheel adjustment.
Ive seen some replaced with a 6mm bolt and nyloc nut, seems to work.
The best solution to the locking is to replace the thumbscrews with m6x30mm clamping levers and stainless washers, it will not move once they are tightened

Excellent info. Thanks. It makes sense. If the pin is locked to the height adjustment eye, then its diameter doesn't really matter.
I'll order some clamping levers.