Well so much for brand new BSA mk2 .....

#113 O-ring is 9/16"ID, 3/4"OD, 3/32"CS. I bought some last week at Ace Hardware.



https://m.youtube.com/watch?feature=plcp&context=C38c1186UDOEgsToPDskIFyjHKUu0oJ5mp97yJITQ2&v=8UqYZ9enbdM

Mine started leaking to quickly after I got it and I could hear it coming from the rifle. It was the buddy bottle o-ring and after searching the net I found it is the most common leak on the rifle. Though the oring looked fine I swapped it with a new one and it been fine since. Either way buy a handful of #113 orings.

Its leaking from the gun not the tank and another alarming thing is the tank says 2014 and after the serial number on the gun I see a dash 14 which makes me think this gun is four yrs old ??? As soon as I put the tank back on I could see the gauge go back to 3000 but could hear air coming out of the breech area .

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I suspect that is the reason it was so cheap. It has probably been either in a warehouse or on display for the last 4 years. Don't open it up. Just send it back and tell them you know how old it is and you want a new one or at least new seals from top to bottom. It's not good for a PCP to be stored for that long without service or use.

Mine was also -14. Judging by the condition of the o-rings that I replaced and the price reduction, I have no doubt that it is 4 yrs old. Good news is that after a little TLC it is working great and is a very accurate and consistent gun. 

To determine the DOM you have to use the serial number on the gun, not the bottle. I doubt the gun is 4 years old...... Just the bottle. Furthermore, BSA doesn't make the bottles. They are outsourced. The age of the bottle does not reflect any issues in this case. 

One of the big contributors to the difference in price is the Mk2 does not have an over-price Minnelli walnut stock with the rose wood, or Palisander wood inserts that accent the fore end and the base of the pistol grip as well as the precise laser cut chequered panels. 

Also the regulator. The Mk2 is less efficient than the SE. No specific details other than BSA claims the SE is 11% more efficient than the Mk2.

And the CCS or Customer Configurable Shroud.

I sent an email with my guns' serial number to BSA inquiring as to how to decipher it. It's my understanding through the UK's BSA forums it may take a day or two for a response. I'll update here as soon as I hear back. 

Ok gun filled to 3000 and I unscrewed the tank off and will reinstall in ten hrs....at least like Dave said find out where its leaking .

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Make sure you remove the bottle correctly. If you dont you will cause another leak by ruining the o-ring on the bottle. You have to loosen the bottle about 3/4 turn then shoot the air out of the regulator. Once the air is out of the regulator you can unscrew the bottle completely. If the reg doesnt empty within 6 - 10 shots unscrew the bottle a little more and repeat the shooting until the reg is completely empty.

You know, it’s funny I talked to two different shooters yesterday @ a shoot I was at and both recently purchased new AOA guns, both came to them w/air leaks?

New guy here, I made an account to say I am in the exact same boat with my R10 mk2 that I just got from Pyramyd. Gun came with a little over 200 bar in the tank, holding fine. After the first fill up it starts leaking. I can hear it coming out near the fill port. Sounds like it's leaking at the fill port or from the gauge. I tried cleaning and lubing the orings at the bottle, valve and gauge, still leaks. Pretty bummed out actually, this is my first PCP rifle. Seems most of these guns leak.

Also, I just picked up a 113 o-ring to try on the buddy bottle just for kicks, that is definitely not the correct size. Far too large.

Hope bsa responds fast because all these bsa that have been sold have that dash 14 on it ....I just thought the 14 ment 2014

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I believe that the gun will be the same age as the bottle. I don't believe that BSA would use old stock bottles when assembling new guns. The price of those sale guns had to be well under the wholesale dealer price. It had to be the importer wanting to clear old stock that was not moving and witting off the loss.

Try a 111 oring on the buddy bottle if 113 is too large. I bought a bunch of 111 as I read that was the size and then later I read 113. 113 was the fit for my bottle. Even if it doesn't fix you current leak you will want these on hand for the future. So it's not a waste of time and money.

Also check out all the videos on XTX Air. They pretty much show you everything to take the rifle down, replace orings, etc. They are simple rifles. I am new the the R10 as I just got one myself. What I have learned from other PCP rifles that come with leak issues is that it is a 10 cent oring. Yep it sucks taking apart a new rifle to make it right but for a couple bucks (less if you knew exactly which o-ring) and 30-45 minutes (1st time taking it apart, less once you have done it) of my time I learn everything about the rifle quicker than I can box it up and go the the post office. Once I learn the rifle I don't need warranty, etc. It makes me a free man. The only way to fully understand how a paticular rifle works is to take it apart. Once you gain that knowledge you can figure out all sorts of things to do. I work on a lot of other people's air rifles as I run a air gun range. I didn't know anything about fixing air rifles when I started. I figured it out from necessity. Heck I was scared. What I learned was they are simple (some triggers can get crazy, but the R10 trigger is simple so n fears). 

XTXair.com has some excellent videos on servicing the R10 and after watching several of them, I am going to roll with rodeo on the check valve gunk. Here is a link to the video where Darrin services and cleans the regulator block. 

https://youtu.be/XPVg3mDI8kE

Looks pretty straight forward. Personally, I'd take a swipe at it before blowing up and going to the hassle and expense of sending the gun back. 

What do you have to lose? If it still leaks then send it back. 

Exactly my point. What do you have loose by checking it out? You will gain knowledge even if it doesn't work out. It most likely will work out.

If you open it up and they can tell that you have, you will void your warranty. What expense is there in sending it back? I'm sorry but I am not familiar with the consumer laws in the States. Here in Australia the dealer or supplier has to pay any freight that is necessary as well as parts and labour. Even if something is out of warranty if something fails to live up to reasonable, fit for purpose expectations, it will be covered. I have read of instances there where the dealer asks for return shipping on warranty work. That would not be tolerated here.

Bottom line. If you send it back you will most likely get a replacement from the same batch that your first one came from. Therefore, chances are pretty good that the second one will leak also.

The XTX videos are well done and easy to follow. The fill port check valve cleaning is not very difficult to do. The R10 mk2 is a very nice rifle and at the clearance price a great deal. Well worth the time and effort to take apart, clean, change o-rings and fresh lube.

After doing mine (with a slight hammer spring adjustment) - 50 shots with JSB 15.89 - avg 866 fps - es 14 - sd 3. Very accurate. I did do a full disassemble clean, lube and replaced several o-rings.

To the earlier question of, "When was it made?"

BSA replied and quickly I might add, to my request as to the DOM of my gun. It was made in 2015. 

@eaglebeak -

According to Pyramyd website (seller) their policy is:

Exchange/refund policy

• You may return any item in new condition (unused) along with its original packaging and any accessories for a full product refund within 30 days from date of receipt.
• Please note that shipping charges are not refundable unless the item received was defective. Items which are not in the original packaging or otherwise not in new, salable condition are subject to a minimum 20 percent (20%) restocking fee.
• Do not attempt to disassemble any items. Attempts to change the appearance or function of any item you purchased from us will void the warranty and your right to return the product for a full refund.
• All returns must have an RMA (Return Merchandise Authorization) number. For your convenience you can complete the request for RMA online via the Pyramyd Air Website. Please click this link, select the "Return a Product Tab" and complete all applicable information. When finished hit send and the request will be emailed to Pyramyd Air Returns. We will issue you a RMA# (Return Merchandise Authorization number) once the authorization is approved
• Please write the reason for your return, phone number, and RMA# in the space available at the bottom of your invoice. Keep a copy of the invoice for your records.
• Enclose the slip in the carton and be sure to package the items securely.
• If you have received a return label from Pyramyd Air, please affix to the box and drop off the package at the nearest UPS facility.
• If you are shipping the package directly (without Pyramyd Air provided label) please send it to the following address:
  Pyramyd Air
  5135 Naiman Parkway
  Solon, OH 44139
• All exchanges and refunds will be processed within 2 weeks from the moment we receive all item(s) back.
• If you have any questions, please call us at 888-262-4867

According to the Gamo website (for warranty service) 

All Returns:
Shipping and Handling Fees: Consumer is responsible for all shipping fees to GAMO USA, as well as all return shipping fees after repair or replacement. All shipping fees are non-refundable.

If sent to PA, they aren't going to service the gun so they won't even take the stock off of it. They will just ship it back to Gamo for warranty. And furthermore, the task of servicing this particular issue is so simple and straightforward, according to XTXair, I doubt even a BSA tech could tell you turned a screw on it. 

@rodeo

I'm with you on this. If I didn't have to get mine ready for a FT match this weekend, I'd have mine apart. But that will happen when XTXair gets their regulators back in stock

And I get it. Trust me.

It is so frustrating to spend this kind of money, looking forward to the enjoyment of shooting such a fine rifle and have this happen knowing you may have to send it off and be without it for several weeks. It sucks.

Those of you with this problem, please let us know what you decided. Return it or service it. I'd be curious to know. 

Yup, I had that disappointment when mine started leaking. Yes, I had that apprehension of opening up a brand new rifle, but I do enjoy finding out what makes them tick. If you do decide to fix it yourself, you can order complete o-ring kits from "across the pond". It is an added expense for a brand new gun but it worth it to me. Gamo / Pyramyd Air / BSA should get a few of these kits shipped over here and make them available for a discounted price - just a good customer service thing to do. If you live near MD, send me a pm, bring your R10, an o-ring set, and a beer. We can spend a little time to fix your leak, take it out back to try it out, talk about AG's over that beer and I've made a new friend.

And I’ll backup rodeo on this one too.

If your near the Tulsa Oklahoma area or, if you will be in the Dallas area this Friday and Saturday only (attending the FT match Saturday) let me know and I’ll be happy to have a look at your gun.