Tuning HW100 Replacement Air Cylinder

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nugria

nugria

Member
Sep 7, 2019
169
5
Florida, United States
Hi All,

Still new to this stuff. I've an old HW100, .177, 600mm barrel. My air tubes, while looking great inside, are well over their rated life expectancy (like 5 years). This being said I'm on the hunt for a new air tube.

The current tubes are 175cc that fill while off the gun. The gun will fit up to the FAC XL length tube. From what I can find in stock, my options look like:

1.) Ratworks aftermarket tube

2.) Fenton TI tubes

3.) Krale has the 105cc HW100 tube (way too small IMHO)

4.) Someone here might know of HW tubes in stock? I'd like to get no smaller than the 175cc tube

I promised my better half I'd not blow myself up with this hobby. The HW tubes are likely most reliable/safe? Any commentary on the Ratworks aftermarket tubes or the Fenton Tubes. I've tried to track down specific information about he split aftermarket tube without much success.

I guess a new gun might be an answer. The old gun just shoots so wonderfully and maybe the 16 years of use have smoothed out the rough edges.

All commentary welcome,

Thanks,

Nugria
 
Send it back to Weihrauch in Germany. They will probably recertify it. Email them first. They usually respond back within a couple of days. You just have to pay shipping to Germany, they generally pay to return it. However, it will probably take a while with return customs, COVID worker reductions, etc. It took nearly 3 months for mine. However, most of that time in sat somewhere in customs/shipping. Weihrauch did their part within a week of receiving it on my end. If they have it in stock, check AOA since they are the US distributor and warranty service center for Weihrauch. Good luck and happy shooting!
 
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Looking great inside? Exp. dates on tubes are not the norm, mostly seem on competition pistols and rifle for UK/other use. "Law" in the U.S. if under 2" dia. no worries -so a good visual may suit you?- Many over 20 yr old tube airguns around w/out issue.

The threads if firing 100,000 shot might be a bigger issue. A replacement tube likely (but I do not know) will have no date stamp. So may not used used in some sanctioned competitions. Somewhat depends on your desire and personal comfort level.

John
 
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The tube on mine is from 2004. Looks brand new inside as well. They are stainless, and extremely overbuilt. I'm not concerned in the least about mine and would never bother to have it recertified. I swapped a new quickfill end onto it years ago. 

No other manufacturers claim to need their cylinders recertified, and all of them are much less robust. Since the cylinder is removable, it's classified as a gas cylinder (same as a welding tank, etc) in europe so under technicality "needs tested". 

Thats why Weihrauchs "need tested" and Air Arms, Crosman, etc etc do not. Funny that the most overbuilt air cylinder on the market is the only one to get the shaft lol! 

I have a Ratworks aluminum tube on my other HW100. The tube itself and threaded end is fine, but the fill/gauge end is garbage. The check valve is nothing but a screw threaded into a hole with an oring under the head. Fills very slow, whistles and leaks and the gauge is very cheap. I swapped Weihrauch ends onto mine and it's fine. I had a carbine cylinder laying around to rob the ends off. 

Myself, I wouldn't use any cylinder that didn't use factory HW ends, because they are excellent. They have a real WIKA gauge and well designed fill valve. You may not be able to buy just a HW cylinder end, unless it's used. Check ebay.uk or similar. 


 
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Hi All,

I'll give the 2 regulator thing a thought. Might be a handy way to get high and low power from the same platform. You would need a reservoir w/o a regulator and a reservoir with a regulator (2 differently configured reservoirs).

The regulator in the gun is set at a higher pressure. Let's say 120 bar. If you want to shoot heavies or fast a higher regulator pressure would be good. With this configuration you would shoot an air reservoir w/o a regulator in the reservoir.

If you want to shoot indoors or slow, screw a reservoir onto the gun with a lower pressure regulator like 80 bar in the reservoir. The 120 bar regulator in the gun doesn't do anything now. Just like shooting your gun below regulator pressure in a single regulator gun with a single 120 bar regulator. The valve sees 80 bar air. Reset the hammer spring for the lower pressure and you are off and running with a 8 or 12 fpe airgun.

That is what I might do.

YMMV,

Nugria

Late addition: My HW100 factory regulator in the gun is currently set at 90 bar from the previous owner. Thanks to let me know not to go any lower!
 
Upvote 0
Hi All,

I'll give the 2 regulator thing a thought. Might be a handy way to get high and low power from the same platform. You would need a reservoir w/o a regulator and a reservoir with a regulator (2 differently configured reservoirs).

The regulator in the gun is set at a higher pressure. Let's say 120 bar. If you want to shoot heavies or fast a higher regulator pressure would be good. With this configuration you would shoot an air reservoir w/o a regulator in the reservoir.

If you want to shoot indoors or slow, screw a reservoir onto the gun with a lower pressure regulator like 80 bar in the reservoir. The 120 bar regulator in the gun doesn't do anything now. Just like shooting your gun below regulator pressure in a single regulator gun with a single 120 bar regulator. The valve sees 80 bar air. Reset the hammer spring for the lower pressure and you are off and running with a 8 or 12 fpe airgun.

That is what I might do.

YMMV,

Nugria
Click to expand...

You can take the HW reg out and use it as a air chamber. I never thought about using both regs.

There service is good they will answer all your questions just tell them you are fac.
 
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The key being, you will have to adjust the hammer spring, which requires removing the stock, and the cover plate from the rear of the action. And also the locking setscrew in the hammer shuttle. 

You'll find that simply adjusting the hammer spring will vary the power how you want. A regulator setting of 80Bar has been too low for anything in my guns, even down to 10fpe. 

I throw away the locking setscrew in the hammer, and drill an access hole in the hammer cover plate, and clearance the stock so I can adjust the hammer on the fly with a turn of an allen key. 


 
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Click to expand...

You can take the HW reg out and use it as a air chamber. I never thought about using both regs.

There service is good they will answer all your questions just tell them you are fac.
Click to expand...

If you remove the HW reg, what prevents air escaping through the weep hole in the receiver?
Click to expand...

I don't know but I'm sure HW00 tunning have said you take the old reg out and use it as a air chamber.
 
Upvote 0
Click to expand...

You can take the HW reg out and use it as a air chamber. I never thought about using both regs.

There service is good they will answer all your questions just tell them you are fac.
Click to expand...

If you remove the HW reg, what prevents air escaping through the weep hole in the receiver?
Click to expand...

I don't know but I'm sure HW00 tunning have said you take the old reg out and use it as a air chamber.
Click to expand...

Well, there is a hole there, and if the reg is removed, air will escape. If folks are using a cylinder reg in place of the receiver reg, they must be removing the disc springs, but leaving the parts with the sealing O rings. I haven't had my reg out, so I'm not sure of its assembly design, but I think that area will have to remain sealed. 
 
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