O Ring Blowout

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O Ring Blowout
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O Ring Blowout
(2005 Video)










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What Causes a Breech O-Ring to Blowout?
Thread starter Ezana4CE Start date Mar 7, 2021
Jan 15, 2021 3,149 1 124 Texas, United States
Aug 28, 2020 8,342 92 Excessive Flatulence, United States
You probably didn't close the bolt all the way home and down. Complacency at work...
Jan 21, 2018 2,484 167 MS, United States
The bolt flying open explains it...if the bolt doesn't stay closed during the shot cycle, it's not supporting the O-ring and the blast of air caused it to dislodge. It has nothing to do with being regulated or continuing to shoot below the regulator's setpoint.
Jan 15, 2021 3,149 1 124 Texas, United States
Ok cool. So it seems that it’s just a matter of the air pressure escaping through the path with least resistance, right? I was mainly concerned that I may have damaged something. From what you guys are saying I shouldn’t have much to be concerned about, right?
Dec 18, 2020 194 5 Louisiana, United States
When mine blew out it was because it was not all the way forward and once it came out it stretched and would pop out on every shot after i replaced no problem i just careless i make sure the bolt is closed now .
Aug 29, 2018 4,081 166 NY, United States
@Odoyle, and @nervoustrig, answered you. I have shot thousands of pellets through my Bantam Sniper HR all on the original breech seal. Make sure that bolt is closed.
Jan 15, 2021 3,149 1 124 Texas, United States
@L-Leon I get that and thank you all. Now my only other concern is knowing whether or not this can cause any other sort of damage. Anyone think I should be concerned about any type damage on the rifle as a result?
Aug 29, 2018 4,081 166 NY, United States
@ezana4ce, no damage, just replace breech seal and continue to enjoy that sweet gun.
Jan 15, 2021 3,149 1 124 Texas, United States
@L-Leon That’s what I was hoping to hear. Thanks. I do enjoy shooting it. It shoots very well! Now if I can only work my skills up to the level of the gun’s capabilities.... 
Jun 12, 2019 219 16 MO, United States
I did the same thing when my Bantam HR was new, now I make sure bolt is closed and down if I dry fire. Thousands of rounds now and has not happen again.
Feb 14, 2021 123 3 Montana, United States
Just like in a firearm, there should be a sear disconnect that does not allow an airgun to fire unless the bolt is fully turned down. One day I forgot to unset the set trigger on my CZ 527, and when I chambered another round, the rifle fired when I loaded another round and turned down the bolt. The bolt did not blow open as the striker cannot be released until the bolt lugs are mostly engaged. I got a bit of a scare, and luckily the rifle was pointed downrange on shooting bags. I adjusted the set trigger to a higher pull weight until it would not fire when the trigger was set and I aggressively operated the bolt 6 times, as the magazine holds 5 rounds and I wanted a small margin of safety. Problem solved, and the set weight trigger pull weight increased only slightly. The CZ rifles with single set triggers are not for those who forget to unset them if not taking a shot immediately. I never fail to unset my trigger if not taking a shot immediately after that day. I also did the same with my CZ 550 as CZ seems to adjust the pull weight too lightly as they come from the factory. Anybody with a CZ rifle with single set trigger should do what I do and operate the bolt aggressively a few times with the trigger set and see if it fires. The adjustments were no more than 1/8 turn of the adjustment screw. I occasionally retest the trigger to see if the adjustment has held. I also had the bolt blow open on my BSA Lonestar .25 as the probe catch was only slightly engaged. I did not lose the probe o-ring, but somehow the pellet blew out backwards and was stopped by the rear scope mount. If the open sights had been used, I would have had a pellet in my face or eye. I solved the problem by pushing forward on the probe TWICE and making sure the probe catch is in the full upward position. The incident had never reoccurred, and I make sure I have shooting glasses on when I shoot the Lonestar. I would advise anybody with a Lonestar, Hornet or similar type BSA with the push probe/MMC system to MAKE SURE the probe catch is fully engaged as there is no sear disconnect if the catch is not fully seated. Especially important if using open sights as there is no rear scope mount to deflect the blast from your eye.
Jan 15, 2021 3,149 1 124 Texas, United States
@Beezer I’m not familiar with set triggers. I’ll have to look that term up. Thankfully the tank pressure was just about as low or lower than the reg when my incident occurred. The ring landed where it is in the photo. The pellet went down range and hardly deformed as the others usually do. I think I recovered it protruding out of the cardboard behind the target when I removed them. Having a projectile blowback out towards your face is alarming. The closest I’ve seen to that is stacking so many pellets in group tight enough for lead to bounce off of lead causing some to ricochet out 10-15 yards towards me seated at 25 yards. That’s occurred several times shooting 10 shot groups. 
May 25, 2018 777 12 Airzona, United States
Really spicy curry can cause that sort of blowout.
Jan 15, 2021 3,149 1 124 Texas, United States
Really spicy curry can cause that sort of blowout.
Jan 15, 2021 3,149 1 124 Texas, United States
Feb 15, 2018 99 0 60 Maine, United States
Good job,you might want to use brass picks so you dont scratch the chamber though.
Jan 15, 2021 3,149 1 124 Texas, United States
Good job,you might want to use brass picks so you dont scratch the chamber though.
Jan 23, 2017 761 9 Michigan, United States
Forget the picks and use a wooden dowel. Pinch the o ring and shove it into the breech. Slide the dowel down the barrel while holding your finger over the breech hole. Pop. It’s that quick.
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C&B Equipment, INC. BLOG Seals 7 Common Causes of O-Ring Failure

September 2, 2021
By C&B Equipment
Seals Kalrez • o-rings 0 Comments


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O- ring seals are some of the most common seals used in machine design. They prevent the loss of fluid and gas and are incredibly inexpensive, easy to make, reliable, and have simple mounting requirements.
Although O-rings are designed to be seated in a groove and compressed between two or more parts, they vary drastically in cross-sectional shape, color, hardness (durometer), and curing method.
Every manufacturer designs its O-rings to solve a specific problem for a particular application, so you must select your O-rings based on their functionality and your requirements.
With so many brands, shapes, and sizes to choose from, it can be challenging to determine the best fit for you. Thankfully, C&B Equipment has the extensive knowledge and practical experience to ensure your O-rings are nothing short of… well, boring. Let’s face it. If your O-rings aren’t boring, then they are likely causing problems.
The following are common causes of O-ring failure . This troubleshooting guide will help you identify issues with your O-rings, explain what is causing those issues, and help you prevent similar problems in the future.
Compression set occurs when an O-ring becomes squashed into a flat-sided oval. It won’t recover after removing the stressor, and it has permanently “set” into the deformed shape. Compression set is one of the most common causes of O-ring failure .
The following are common causes of compression set.
Use an O- ring material with low compression set and high temperature resistance. Check the gland design to make sure the O-ring isn’t over-compressed. Reduce the system’s operational temperature if needed and alleviate excessive frictional heat build-up at the seal face.
Extrusion occurs when high stresses force the O- ring material into the clearance gap between the mating flanges. Pulses of high pressure cause the clearance gap to open and close, trapping the O-ring between the sharp edges . This causes physical damage called “nibbling.”
The edges of the O-ring on the low- pressure side will have a chipped, chewed, or frilly appearance. Extrusion and nibbling usually occur in dynamic applications like hydraulic rods and piston seals.
High pressure above system design and tolerances and excessive or irregular clearance gap s are common extrusion causes. The O- ring material may be too soft, or the O-ring installed too large.
Reduce machining tolerances to decrease clearance. Ensure installation of correctly sized O-rings and try a more rigid material if necessary. Use backup devices to reduce clearance gap s. In some cases of extrusion and nibbling , O- ring size and shape are the problems.
For sealing applications with unusual geometries, custom-made O-rings, such as those offered by Kalrez® , may be an appropriate solution.
Abrasion occurs when there is repetitive contact between the O-ring surface and the housing. The excessive friction wears down the sliding contact faces of the O-ring, resulting in wear lines or even deep scratches and breaks.
The surface may look dull or glazed, and one side of the O-ring will be worn flat. Abrasion is typical in dynamic applications that involve rotary, oscillating, or reciprocating motion.
Inadequate lubrication, improper surface finish on metalwork, abrasive particles in the system fluid , and excessive temperatures can cause abrasion.
Ensure adequate lubrication and the correct surface finish on metalwork. Check the system fluid for contaminants and install filters or wiper/scraper rings if needed. Consider swapping to internally lubricated O-rings or an O- ring material with higher abrasion resistance.
Explosive decompression, also referred to as gas expansion rupture, occurs when high-pressure gas becomes trapped within the internal structure of an elastomer seal.
When exposed to high-pressure gas at high temperatures for an extended time, the O-ring’s polymer compound may absorb the gas. When the system pressure drops, the trapped gas expands to match the external pressure, causing surface cracks and blisters as the gas escapes.
Small amounts of gas may have little effect on your seal’s integrity, as the blisters may recede after the pressure equalizes. However, excessive amounts of trapped gas may cause severe damage or even rupture the O-ring.
Increase time for decompression and reduce system temperature. Choose an O- ring material resistant to explosive decompression or use an O-ring with a smaller cross-sectional size.
Many chemicals will react to certain O- ring materials . Degradation occurs when the O- ring material is unable to withstand the effects of a particular chemical. Elevated temperatures, excessive stretch or compression, and mechanical stresses can accelerate chemical attacks.
A degraded O-ring may show discoloration, blistering, cracking, or a change in shape or hardness. The specific indications vary by chemical reaction.
Choosing a suitable O- ring material is key to preventing chemical degradation. For the best chemical resistance in high temperatures , the gold standard is perfluoroelastomer (FFKM) material. Kalrez® FFKM O-rings resist attack from more than 1,800 chemicals, solvents, and plasmas while offering high temperature stability .
Chemically induced swelling occurs when there is an incompatibility between an O- ring’s material and its environment. The seal absorbs the media, growing in volume to the point of malfunction. The swelling may occur across the entire O-ring or only in the places exposed to the chemical. The swollen O-ring may extrude out of the seal grooves.
The only way to prevent this problem is to use an O- ring material chemically compatible with the system environment. Consult chemical compatibility charts, and don’t hesitate to consult a sealing material expert .
Kalrez® O-rings resist extreme volume swell when exposed to steam, sodium hydroxide, concentrated nitric acid, ethylenediamine, and many other chemicals and solvents.
The leading heat-related causes of seal failure , hardening, and embrittlement occur when the application temperature exceeds the maximum temperature rating of the seal material . It can also occur due to excessive temperature cycling. The seal material hardens, and oxidation causes the seal to crack.
The surface of a heat-degraded O-ring may appear pitted or cracked, especially on the areas with the most exposure. This problem often occurs in conjunction with compression set due to a loss of elasticity, so the ring may appear flat.
Use an elastomer O-ring with high temperature resistance. Kalrez® FFKM o-rings deliver outstanding high temperature stability . Even after long-term exposure to temperatures up to 327°C, Kalrez® FFKM o-rings retain elasticity and recovery properties better than other high-temperature elastomers.
C&B Equipment is proud to be a licensed distributor of Kalrez parts® . The superior performance of these seals helps you increase your uptime. Our goal is to eliminate your business’s downtime through top-of-the-line products and services . That goal is what we refer to as Uptime Solutioneering™ .

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O Ring Blowout : Directed by Tim Von Swine. With Jasmine Byrne, Erik Everhard, Steve Holmes, Tiffany Hopkins.
report. Whoever tells me their best cigar related story can have my CI $10 coupon. End 12/18 by hmblm12 in cigars. [-] O_RING_BLOWOUT 3 points 8 years ago. Shortly after my 18th birthday, I headed on down to my local B&M to pick up my very first premium cigar. I walked in and saw exactly what I was looking for, a CAO Italia.
O Ring Blowout (Video 2005) cast and crew credits, including actors, actresses, directors, writers and more.
Mar 8, 2021 What Causes a Breech O-Ring to Blowout ? Thread starter Ezana4CE; Start date Mar 7, 2021; Jump to latest Follow Reply . Ezana4CE Member. Jan 15, 2021 3,019 36 Texas, United States. Mar 7, 2021 #1 ; ... I did not lose the probe o-ring , but somehow the pellet blew out backwards and was stopped by the rear scope mount. If the open sights had been ...
Sep 2, 2021 Extrusion occurs when high stresses force the O-ring material into the clearance gap between the mating flanges. Pulses of high pressure cause the clearance gap to open and close, trapping the O-ring between the sharp edges. This causes physical damage called "nibbling."
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