Breech O-rings

[RatAssassin]

Hey all,

Just wondering. For my company and our pest control needs, I went and bought 3 PCP air rifles.

Let's just say it's not going well.
I found JSB's getting stuck and the skirts tearing, hard cycling, etc.
I sent my first Akela back due to a trigger issue. The second one tore skirts apart, hard cycling. Changed pellets. Seems to work ok now.
I have been so busy, I haven't even tried the third one yet. It's a Hatsan Bullboss due to the nasty conditions we will use it in.
To be honest, I don't even want to try it. The whole PCP thing has been such a total let down. I won't even take it out of the box. I got it months ago.
I get it. In todays world, quality control is nonexistant. Everything comes either pre-broken or you need to modify/ fix everything before using it. This is the world we now live in.

Apparently, I need breech O-rings. Lots of them. The Akelas eat them like a fat kid in a donut shop. The sad thing is that I've gone through a few and the last one lasted @100 rounds. And of course, the tech at Crosman says it's easy to do without taking the barrel off. Yeah....I have a fleet of vehicles and equipment for my business I maintain without a problem. The whole o-ring replacement without taking the whole dam thing apart wasn't happening.
This is my busiest time of year. I just don't have time for this. I do like the accuracy, though.

I've read that there are some more durable o-rings out there. Can anyone hook me up with some info on where I can get .177 and .22 caliber decent O-rings?
I was so pissed off today, I almost threw the one rifle in the trash. And I'm the kind of guy who will not burden someone else with my problems. I WILL toss it in the trash.

It's to the point, I look what I have invested, the compressor, the 3 rifles and I just get sick.
I'm a life long shooter (mostly rimfire) and "upgraded" from springers which I have used for decades without issue.

*ETA_ I have maybe 3 sessions on the one Akela and only 1 on the other. None on the one still in the box, as I'm too pissed off to even try.

 

[nervoustrig]

Polyurethane is the most durable material in terms of abrasion and tear resistance, but if the gun is eating them like a fat kid in a donut shop, the problem goes beyond the O-ring material. Something is rough, sharp, misaligned, or sized wrong. The pellets themselves should not cause any meaningful wear to the O-ring. It should last for thousands of shots.

 

[Gerry52]

Mcmaster-Carr & Oringsandmore are 2 great sources for o-rings!

 

[RatAssassin]

Mcmaster-Carr & Oringsandmore are 2 great sources for o-rings!

Nice. However, I don't know what sizes I need for .177 and .22
Does anyone order from them and know? I'm going to need a part number or size to order correctly.

Because here's my problem. On nights when we do our control measures. We shoot about 100 times each.
Therefore, I have to always take the compressor and now spare orings with me to replace in the field on a tailgate field kit and rest. I also need to sight in before resuming due to having to take apart the barrel and pull the scope rail off.
It's highly inefficient, but I'm willing to try because of the better accuracy, despite costing me time and $$$ in parts and labor.
I wish I had the time to treat this like a hobby, but I don't.
Stuff should just work at least half decently without having to constantly fix stuff.

 

[Gerry52]

Aren't there exploded diagrams for your gun(s) on the Mfg website? That's how I always get the needed o-ring sizes for my guns.

 

[iAMzehTOASTY1]

Nice. However, I don't know what sizes I need for .177 and .22
Does anyone order from them and know? I'm going to need a part number or size to order correctly.

Because here's my problem. On nights when we do our control measures. We shoot about 100 times each.
Therefore, I have to always take the compressor and now spare orings with me to replace in the field on a tailgate field kit and rest. I also need to sight in before resuming due to having to take apart the barrel and pull the scope rail off.
It's highly inefficient, but I'm willing to try because of the better accuracy, despite costing me time and $$$ in parts and labor.
I wish I had the time to treat this like a hobby, but I don't.
Stuff should just work at least half decently without having to constantly fix stuff.

I'm in that boat; I've had stuff not work, under warranty: it gets sent back for repair or replacement.
That's a bummer on your luck though
Maybe you can send them back?
I've been reallyyyyy careful on my pcp purchasing. So far, no bad news.
Hope you get things sorted

 

[nervoustrig]

We shoot about 100 times each.
Therefore, I have to always take the compressor and now spare orings with me to replace in the field on a tailgate field kit and rest.

No doubt that is incredibly frustrating. Along the lines of what you said previously, maybe it would fly for occasional use but that's not sustainable for an airgun pressed into service for pest control duty. You should be able to shoot 1000 times a night and have no concern of needing to replace the breech O-ring. Your best bet will be to either have a skilled airgun smith work on it or gather some suggestions and purchase a different airgun. I stopped myself short of saying a better quality airgun because it's not like the Akela is at a price point where such a quality issue is common. Not even among airguns half its price.

 

[RatAssassin]

Aren't there exploded diagrams for your gun(s) on the Mfg website? That's how I always get the needed o-ring sizes for my guns.

I could. I know the part number and could order them from Crosman, but at $10 for two and the rate they seem to go through, every session, tear down, replacement, re sight in is going to cost me $10 every time I pick up the rifle to use. I may as well shoot centerfire rounds if I'm going to spend that much money and time.

That's why I'm asking where I can get better Orings.
I can't keep sending these things back and forth. I have a business to run, not a UPS shipping hub.
These Akelas have a been a massive pile of fail so far. So bad, I can't even bring myself to break out the other one I bought. Its my busy season and I don't need yet another thing to deal with.

 

[Gerry52]

Really sorry for your problems & frustration. If you could get to the root cause of WHY that's happening to your seals THAT'S where I'd be putting my energy & time. There must be a sharp edge, burr or even foreign object that is causing seals to be repeatedly chewed up. I know your time is valuable & patience is low but other than tearing down gun & diagnosing problems or sending back under warranty your options are limited. That problem is not acceptable.

 

[JimNM]

O-rings are sized by three dimensions.

Cross section
Outer diameter
Inner diameter

.22 should be:

Cs 1.5mm
Id 5.5mm
Od = 2x cs + ID

Take a fresh o ring and measure with cheap caliper. Note the size. Search Amazon for matching description. Buna N class is very durable. Buy a bunch.

First thing to do is figure out WHY you are killing o rings. I shoot 20,000+ pellets a year and have replaced 5 breach O-rings in 8 years. Mostly due to cleaning devices damaging the O-rings. For air guns, don't clean the barrel until you must to keep on target. Excessive cleaning only causes excessive problems.

 

[Headshots]

You probably would be happier with a Gamo Urban made in the UK seldom have problems. You wouldn't have much trouble with a Daystate Huntsman or a Taipan Veteran or Brk . I can't type the full name , don't want to start anything. I think the 500 buck range is a hard pick but theres got to be some sleepers out there .

 

[RAMJET66]

buy a umarex Notos & your troubles will be over , great little airgun , i have had one for over 2 months, trouble free, didnt like the stock mag, & purch 2 carm 12 shot mags & it is great , + they are cheap, usualy under $ 300, since i got the notos , it is all i shoot, & i have plenty of A/guns costing 7 to 8 times the cost of the Notos..

 

[Ezana4CE]

I could. I know the part number and could order them from Crosman, but at $10 for two and the rate they seem to go through, every session, tear down, replacement, re sight in is going to cost me $10 every time I pick up the rifle to use…

That's why I'm asking where I can get better Orings.
I can't keep sending these things back and forth. I have a business to run, not a UPS shipping hub..

@RatAssassin $10 for two o-rings is ridiculous and Crosman is out of line for that. The O-Ring Store came recommended by several AGN members. This bundle cost me about $85 shipped. This is probably around 1000 o-rings.

 

[RatAssassin]

@RatAssassin $10 for two o-rings is ridiculous and Crosman is out of line for that. The O-Ring Store came recommended by several AGN members. This bundle cost me about $85 shipped. This is probably around 1000 o-rings.
View attachment 355719

Cool. Could you perhaps share a part number or how you ordered from this company?
I need the orings for
.22 and .177
It sounds like they are all the same size if I am not mistaken.

 

[Ezana4CE]

Cool. Could you perhaps share a part number or how you ordered from this company?
I need the orings for
.22 and .177
It sounds like they are all the same size if I am not mistaken.

@RatAssassin I don’t have the guns that you have. I did a lot of looking at exploded diagrams, parts lists for different guns, and reaching out to other members with questions about numbers that I didn’t understand or was too frustrated to understand. After about three days I compiled a list of what I needed and a lot of what I was looking for. You’ve received some solid advice in this thread.

I suggest that you do a little more leg work. Maybe start by measuring o-rings that you can hold in your hand and record their size(s). For the others consider reading the exploded diagrams and parts lists that manufacturers publish online and in their instruction manuals.

To order from The Oring Store go to their website and search for the o-ring durometer (hardness), material (generally Buna nitrile), and the size needed (this should be on a parts list or exploded diagram). It helps to know if you’ll be ordering metric sizes or standard sizes. A lot of airgun o-rings I’ve encountered or read on lists are Buna 70 (nitrile). Some have a minimum order quantity that need to be purchased (for example you may have to order a minimum of 10 of one size and 50 for another instead of the one or two that you may need immediately). Then the checkout process is pretty much like most other online vendors. Be mindful if something is not in stock, it may hold up the shipping of your order.

Here’s a link to their website https://www.theoringstore.com/store/