Author Topic: Ham 850 Mag AR (Read 639 times)

Nvreloader · « **on:** December 19, 2017, 02:57:50 PM »

Guys
I can't seem to find the correct answer to my problem,
A little history,

The neighbor HAD a Ham 850, 17 caliber AR, OEM stock, (He bought it new, 7+ yrs ago).
It was sitting in the corner of his shop,
I really don't care for this caliber, but will try it out, I prefer 22 cal.
He made the comment that, "It's yours, for $100", (he knows, I am into guns etc). LOL
He also told me the bolt didn't work right, before I bought it. He stated, that he has shot it less than 1 cylinder thru it,
and then it locked up, bolt don't or won't close, etc.

(bolt moves a little back and forth).

So, being the Idiot that can't resist a gun, It followed me home and put into the "needs work rack",
right now it is 5* inside the unheated shop, too COLD for me be inside for very long..

Being new to AR arena, and knowing nothing about Ham 850 AR, 17 cal etc,
I have 50+ 88/90g cylinders, so that end is taken care of etc.
I'll have to get a couple of mags, it didn't come with any, the owner that he has a couple mags, ammo etc, just has to find it all.

I have not had much luck searching the forums so far, on this make and model etc.

Since, I can not get the bolt to operate in the full range, at this time I am unsure what's in the bbl,
It feels like something is jammed in or around the bolt, the bolt only moves around 1/4" or so.

Being a new (to me rifle), I will completely dismantle, check and clean/lube the required parts,
along with adjusting the trigger to suit me, before I shoot it.

Question for the guys that own or have used a Ham 850 Mag AR.

This AR has a cyl installed and can't be turned etc, so I believe that that there is pressure still present,
I can NOT operate the bolt more than 1/4", to confirm this or deny, or see if this AR has a pellet in the chamber etc,
and the safety dose not feel like it's working right.

Can I safety remove/dismantle this AR, to find out if pressure is still present?

I know nothing about this AR and IT'S inter workings etc.
I finally found a diagram of it's internal workings etc, but no other info was given.

I don't need a Kaboom......

Tia,
Don

Alan · « **Reply #1 on:** December 19, 2017, 05:26:32 PM »

If you don't need a kaboom, don't unscrew it! I suspect you can dismantle it far enough, that you can fashion some sort of degassing tool. The question is, how far have you gone?

sixshootertexan · « **Reply #2 on:** December 19, 2017, 08:35:06 PM »

I'm assuming when you say AR you means air rifle.
Is this the rifle in question?
https://www.pyramydair.com/s/m/Hammerli_850_AirMagnum/913
If so you can unscrew the 88gr cartridge a turn or two and the co2 will escape out the holes on the side of the valve.

Alan · « **Reply #3 on:** December 20, 2017, 05:10:33 AM »

You may be right Ricky, but I assumed it was a PCP.

Nvreloader · « **Reply #4 on:** December 20, 2017, 07:50:32 AM »

Thanks guys,

Yes, it is a air rifle, Hammerli 850 Airmag. 17 cal.

So far, it is just sitting in the corner, untouched, I have attempting to remove the cylinder,
IMHO, it appears to be locked in, just like my QB79, when a live cylinder is in installed.

I know that you should NOT remove the action from the stock, with a live cyl installed, in the QB 79 etc.

Thanks Ricky, I'll check that info out.

Tia,
Don

thwakkk · « **Reply #5 on:** December 20, 2017, 03:15:06 PM »

The cartridge will need to be removed before the stock can be taken off unless the stock has been greatly modified. As stated earlier, you should be able to unscrew the cartridge slowly until the C02 vents out of the side holes in the valve.

The most likely problem with cocking is that a pellet has found it's way into the interior of the cocking/trigger area (it happened to me). To access it, you will need to remove any rings from the top, the bolt handle, and the four screws holding the side plate on.

Before you remove the side plate, it would be a good idea to find pictures of what the innards look like with the side plate off. Since Photobucket stopped allowing links unless you have their paid membership, pics may be harder to find but a quick search generated the following link which may help. There are pins, springs, and nuts that can easily slip out of place and without a good idea of where they belong, it can be quite frustrating.

They can be converted to a PCP with a regulated Ninja style air tank and adapters but I have never tried that approach.

link:
https://www.shootersforum.com/airguns/95536-hammerli-850-a.html

Nvreloader · « **Reply #6 on:** December 21, 2017, 03:50:08 PM »

Well
I finally got the cylinder out, yes, it still pressure in it, had to use a small strap wrench, was jammed tight......
finally got the action opened, and found at least 3 pellets jammed inside, and 2 in the bbl.

Found a part floating around inside also, get it back in it's proper place,
have to fix the stock bolt holes, all mushed out, easy fix,
bolt handle bent, will straighten that out,
bolt nose slightly bent .

Waiting for the new parts to get here, "O" rings, springs, ball bearing, etc
hammer spring just slid back and forth, over 1/8" play, etc.

I am a Happy camper, now........ just waiting for the pony express rider

Tia,
Don

sixshootertexan · « **Reply #7 on:** December 21, 2017, 09:55:36 PM »

I think the free slide of the hammer is on purpose. Kind of like the SSG that Bob came up with. My 850 which was giving to me I had worked on earlier for the former owner. He was complaining about loss of FPS. I made a small spacer to take up the space and it brought the FPS up to factory specs. I also honed every surface on all moving parts and it operates smoothly now. Here's a pic of mine when I opened it. The spacer is inside the hammer.

Nvreloader · « **Reply #8 on:** December 23, 2017, 08:25:54 AM »

Thanks Ricky

The hammer spring would not strike the valve stem, it is so light and lost compression etc.
Mine also has a spacer ring at the back of the main hammer spring,
even with this spacer this spring had NO strength to move the bolt etc.

The 17 cal bolt flopped around during to movement, enough to hit the end of the chamber etc, when cycled,
so I have a new 22 cal bolt coning for it, and will fit to the action etc,
this AR started life as a 22 cal, then was changed to 17 cal, by whom is a ?.

IMHO, the sealing for the valve stem is kinda funky, just that 1 little "O" ring?
There has to be a better way of sealing, just have to figure it out etc.

Did you use the Hammerli slide on scope base for the rings, for scope mounting?

Tia,
Don