Daystate owners - 0.22 pellet probe leaks?

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Regal_US

Member
May 17, 2015
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MD, United States
I recently replaced the pellet probe O-ring on my Air Wolf 0.22 which had a nick. I noticed blow back after the change, but I had not paid attention to this before, so I don't know if its a result of changing the O-ring. I also own a Daystate Huntsman Regal, also in 0.22, and although I have been routinely shooting this using a magazine (which hides leaks when the rifle is discharged) I loaded without the magazine and found a leak from the pellet probe just like that on the Air Wolf.

What I'm calling a leak is as follows: enough air gets pushed out when the rifle is discharged to substantially move a piece of tissue paper place in the breech; we are not talking a gentle puff of air here.

I chronographed the Air Wolf when it was new, and again after changing the O-ring, and the mean velocity and spread were the same, so my guess is that either the leak was there from the start, or the leak has minimal effect on pellet velocity. I'm using both rifles for target shooting, so accuracy is very important to me, and both rifles shoot better than me, so no complaints, but I'm curious about the leak, and if things could be better.

The O-ring I'm using is a -004 Buna-N A90 purchased from McMaster-Carr.

Do other Daystate Owners have similar leaks? Easy way to check is single shot load without the magazine, and either place a finger, or a piece of tissue close to the breach to see if air escapes when the rifle is discharged.
 
I had the same problems with mine and sent it to AOA they told me that it was shooting good no issues, today i did a chrony test and it is shooting an average of 829 fps, when I bought it from them almost 3 years ago the average was 840 fps.. I asked to some friends and they told me that the weather conditions and the pellets can make a small difference..
 
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My Royale has has a touch of air that blows back even with a seal change. Still shoots 900 FPS with 18's My Wolverine .22 seems to seal better but max 884 FPS. I did a full charge chrono group for Dodge 3500 the other day here. http://www.airgunnation.com/topic/raw-and-daystate-shot-count/#post-189909

Eddy 1840 your right.......I just went through a tin of .25 pellets and noticed my FPS was off by 10. Used two different guns and both were off. Started a new tin and immediately it was back to normal. I wish I would have kept a couple pellets and did a measure before I shot them all.
 
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"Dirte"My Royale has has a touch of air that blows back even with a seal change. Still shoots 900 FPS with 18's My Wolverine .22 seems to seal better but max 884 FPS. I did a full charge chrono group for Dodge 3500 the other day here. http://www.airgunnation.com/topic/raw-and-daystate-shot-count/#post-189909
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Dirte. My FX Boss is really tight - not a whisper of air escapes the breech, so tight seals are possible for FX rifles; interesting that your Royale leaks a bit. I'm wondering if the McMaster O-rings I purchased are slightly undersized? I'd have thought that a tight seal was important for accuracy, but it seems I'm wrong.
 
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"Regal_US"
"Dirte"My Royale has has a touch of air that blows back even with a seal change. Still shoots 900 FPS with 18's My Wolverine .22 seems to seal better but max 884 FPS. I did a full charge chrono group for Dodge 3500 the other day here. http://www.airgunnation.com/topic/raw-and-daystate-shot-count/#post-189909

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Dirte. My FX Boss is really tight - not a whisper of air escapes the breech, so tight seals are possible for FX rifles; interesting that your Royale leaks a bit. I'm wondering if the McMaster O-rings I purchased are slightly undersized? I'd have thought that a tight seal was important for accuracy, but it seems I'm wrong.
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I notice that the FX in .22 call for a polyurethane (PUR) seal, and the .177, .25, .30 call for rubber (NBR). The white urethane is pretty stiff. I may throw a NBR in and see if it is a bit tighter. Your o'ring in your Boss is black isn't it?
 
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"Dirte"
I notice that the FX in .22 call for a polyurethane (PUR) seal, and the .177, .25, .30 call for rubber (NBR). The white urethane is pretty stiff. I may throw a NBR in and see if it is a bit tighter. Your o'ring in your Boss is black isn't it?
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Yes - its black. As you know in FX rifles the O-ring is in the breech, not on the probe as in the Daystates, though I don't see that should make a difference. Searching the web I found a post where it was suggested to wrap dental floss on the probe before mounting the O-ring, with the effect of increasing the effective diameter. Buna N A-90 is harder than A-70, which in UK is used for non FAC (< 12 ft/lb) rifles; not sure how PUR and NBR fit into that scheme, but worth experimenting. I think an oversized O-ring is better, no matter what the hardness, because they are inexpensive and easy to replace, but the range of available sizes is very limited, so no room to play, unless Daystate uses some propriety non standard size rings.
 
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The Wolverine 2 has one in the barrel. Metric o'rings come in hundreds of sizes. It seems British like to mix it up between standard and metric. A little conversion you may be able to get a slightly bigger metric. The old dental floss trick has been used by old mechanics for years. It would be nice to get the right fit though. I've been making orders from Orings and More lately and throw some extra sizes in so I have a nice selection. They come in 50 or 100 packs (couple bucks a pack), so if another member needs a size I can just throw it in an envelope and mail it to them.
Let us know what you find for other guys having problems. If you like give me your address in a pm and I will send you a few 004 NBR90 rings..
I have a used Air Wolf MCT coming Friday that I purchased from a fellow forum member. Eager to try it out.

*EDIT Wow!...... It looks pretty rough from the super close up picture.
 
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@Regal_US It sounds like you may have snapped the new o-ring when you were pushing it over the lip of the pellet probe. The pellet probe on the Regal and Air Wolf have a razor sharp lip which is notorious for both slicing and breaking new o-rings when trying to seat the new o-ring. This is especially true with the harder 90 o-rings found on FAC or Full Power Daystate rifles. A broken o-ring can look perfectly fine to the naked eye since the break is often clean.

If your o-ring is not broken and you are still experiencing air leakage, I would try a different o-ring.

Tip: When I replaced my probe o-rings, I would soften the o-ring by letting it sit in a mug of boiling water for a minute which makes it more pliable and somewhat easier to get over the sharp lip without snapping or breaking. Of course, you should apply a generous coat of silicone lube to both the probe and o-ring before attempting to slide it into place.

 
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Bump - no one who owns a 0.22 Daystate (and there are lots on this forum!) has stated whether with the tissue paper test they have a leak or not. It would be useful to know - see original post. Thanks.

Do other Daystate Owners have similar leaks? Easy way to check is single shot load without the magazine, and either place a finger, or a piece of tissue close to the breach to see if air escapes when the rifle is discharged.
 
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"travels4fun"Tip: When I replaced my probe o-rings, I would soften the o-ring by letting it sit in a mug of boiling water for a minute which makes it more pliable and somewhat easier to get over the sharp lip without snapping or breaking. Of course, you should apply a generous coat of silicone lube to both the probe and o-ring before attempting to slide it into place.
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The tip of letting the O-ring sit in boiling water was very helpful; they are a real pain to mount otherwise.

After changing the O-rings on both the Air Wolf and Huntsman, using several turns of dental floss wrapped around the probe before mounting new O-rings, blow back is greatly reduced. I used O-rings purchased from AOA, but these looked to be identical to those from McMaster-Carr at a fraction of the cost ... Without dental floss the leak was unchanged after changing the O-ring, and the 1st time I did this I did not use enough floss, so had to repeat.

From the responses posted here it seems that most Daystates do leak a little from the pellet probe. Its certainly not enough to affect accuracy, or power, because both rifles are tack drivers, and shoot within their normal power ranges. That said, I'm surprised that they leak at all. My FX Boss has absolutely no leak at all.

McMaster-Carr
 
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