Pellet probe inner o-ring seal

I noticed a slight puff from my Daystate Huntsman Classic, so I investigated. The Oring appeared flawless. So I made sure the gun was uncocked and the barrel clear and then closed the bolt and shined a red laser pointer in the breech while looking down the bore from the muzzle. Sure enough, I could see the red laser light shining down the bore in every groove of the rifling. Still, I would expect that during the firing cycle the pressure should compress the Oring enough to seal even the grooves and there should be no air escaping out the breech. I bought a new probe Oring but haven't installed it yet. I'm hoping that it will seal completely, but I have my doubts since the Oring in use now looks pristine. Like you, I'm anxious to hear what other Daystate shooters say about it.

I have noticed the same thing on my Walther MaximaThor. I have a spare Oring but I am reluctant to change it as it appears undamaged. My BSA uses a probe breach seal as well and doesn't leak at all. 

if i block the silencer on my hw100 and shoot it without pellet, the pressure is contained within the barrel and silencer until i release the silencer.
try different size and/or thickness.
the right size is the one which seals man.
...is your pellet probe scored or worn or not going where it should be all the way in or so

I have replaced inner barrel orings on the wolverine 2 and Renegades. One little puff turned into oring flying at me. Especially in .25 with JSBs. Even the new MarkII pellets are tough on the oring. I bet your puffing gun will spit the oring soon, mine was a puff for about a tin. Then out it came flying at my face. 

"Centercut"Is it normal to get a very slight puff of air at aft end of barrel where pellet probe inserts the pellet? I noticed a small amount, very small, so I changed the inner Oring on a Daystate and it’s still the same. A very slight puff of air when I shoot.

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So as to understand better. You are getting a puff of air when inserting the pellet, not when firing the gun, right? 

So, is this a new problem? Or has it been happening all along? Is it affecting accuracy, pellet speed, total shot count per fill? If the answer to all these is no, is it still a problem for you? Or just a mystery to solve? Keep us posted, I want to get a Regal one of these days. 

Got it. Thanks. Absolutely my biggest pet peeve with this industry is a lot of poor customer care and or quality control on guns that cost way too much for them having the issues they have. $1K IS a lot of $, entry level or not. 

Older styles tissue paper was your friend, just lay some over it & look where it is really blowing. But that is a mono-block desih right?

Slightly messy but Talk powder will show whayt's what.
Any chance they vented the shroud like AA?

NO leak is what should be. Swap to a different oring size, mod the probe for ??

John

Inner Oring, I have had them last over a year and had them last a weekend. Can't tell anything by looking at them. I switched over to a Viton material from the NBR and that seems to hold up better. Use a set of oring picks and do it without taking the barrel off. Make sure you use a very small amount of lube too. If you are feeling air on your cheek it is all indications of a barrel oring. 

The blow by air you feel and normal is the mag auto index pin, everytime a shot is taken air is channel back to a piston pin that is under the mag slot you can’t miss it, without a mag put your finger between the probe and hidden pin and fire. You will feels the pin and air hit your finger -/ not going to hurt I promise

This is Daystate ant-double loading prevention devices.

when fired the pin will travel upwards about 1/8” to hit and release a lever under the mag to advance the next pellet.

if you keep cocking the bolt without firing a round it will not advance the mag.

that pin do not have an oring to prevent blow by of air, just tight clearance between the cylinder. 

thanks for the facts. 
John

Centercut, Next time you are at a hardware store buy a wood dowel that will fit down your barrel. When replacing the breach o-ring lube it up good and stuff it in the barrel. Advance your pellet probe to the edge of the o-ring groove and while holding it there run the dowel down your barrel pushing the o-ring back into the groove. Makes it quick and easy to replace the breach o-ring. I have had some breach o-rings that look like new, but on closer inspection are split around the outside so give them a close look. Ernest is correct on the air you feel so your good to go. Sylvan