BSA Service in USA

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JoeC

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Oct 18, 2018
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Sorry if this is not in the right place - I’m pretty new here and tried my best to not violate any rules / procedures.

I recently acquired a used BSA R10 mk2 which appears to be in very good shape. It doesn’t leak, but after struggling to sight it in I realized the pellets were not even getting to the target. 40 shots over the chronograph showed a blistering average velocity of about 415fps with JSB .177 10gr pellets. Two random shots dropped to 333, and a few were as high as 468. I have know idea why it would be this low, even far lower than a euro spec 12ft lb gun, which was my first thought.

Can anyone recommend a good place to service BSA pcp guns in the USA? The closer to Chicago the better for shipping purposes.

Thanks!
 
Im not sure if the hammer spring can be adjusted to that low of a velocity but it could be possible. How consistent were the 40 shots other than the two really low ones? If its shooting really consistent I would say try the hammer spring adjustment first like Brazos suggested. If that brings it up but not enough then try and shoot it down to see where the regulator is set at. If you can determine where thats set at you can see if the previous owner got the regulator and hammer adjustments out of whack. It should be set anywhere from 130 - 150 bar for full power. Maybe the previous owner wanted a low power setup and dropped the hammer spring all the way down and lowered the reg setting. If the reg and or hammer spring are set low its very easy to adjust both.
 
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Thanks for all the responses. The shot string was as follows: 416,423,333,error,404,409,401,417,411,407,414,400,426,429,410,418,418,333,422,402,422,419,error,408,417,418,425,421,425,425,248,438,460,445,431,421,446,448,468,error.

How exactly will I know when it comes off the regulator? I believe the velocity should drop sharply correct? However, if the hammer spring tension is too great, is it possible that it would hold the valve open longer once the gun comes off the regulator, resulting in an increased velocity?

Thanks1
 
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BSA service is an oxymoron, two contradictory words put next to each other. Here in the US, they are still tied up with Gamo and modeled Gamo’s customer service, another oxymoron. So, you have aftermarket service like Charlie mentioned earlier. Or you do it yourself, with help here or from XTX videos.The R10 isn’t overly complicated.

You might contact the seller and see what their experience was, they may have set it up that way, although I can’t imagine why. And seems like they should have mentioned it prior to the sale if they had.

I’m actually surprised that the string was as consistent as it was. Agree that you ought to at least try the hammer spring adjustment before you send the gun off somewhere. Also check out the Robert Lane regulator videos on you tube for tutorials on how regs work and how to tune the gun , etc. Not R10 specific, but some good generic info.


 
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Air Venturi (pyramidair) in Cleveland does the BSA servicing in the US, not Gamo anymore. Gamo’s customers service isn’t great. 



Do do you know if the gun was rebuilt? My regulator worked great until I had to reseal the gun and then it took ages to sort out. It can be done but it’s a pain and in hindsight I should have just got a HUMA reg. Also what fill pressure are you filling to? On my MKI it said you could fill to over 200bar but it works best at 180bar. There might be a knock off valve restrictor on it but it shouldnt have that much of an effect. Hope this helps. 
 
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Adjust the hammer spring first. When you get the stock off you will be able to tell if its set at its minimum. The adjuster is a threaded plug in a threaded hole with a threaded cap covering the hole. Once you get the cover off you will see how many threads are visible in the hole. If its as far out as the cap will allow then its at the minimum. If its at minimum turn it in a few turns and run it over the chrony. If its set a little deeper turn it 2 turns in and chrony it. 
 
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So, I finally had time to take all of your advice. I opened the hammer adjustment screw cap, and found the screw was almost at its minimum tension. I screwed it in to approximately half of its range (halfway down the female threaded portion of the adjuster). I went to take a look at the regulator, and found it covered with an anti-tamper cap. I successfully used a dremel to remove the pin that held it in place and got it off. The regulator adjustment screw was a couple to three threads down from flush. I screwed it in another 1/2 turn. Starting with the tank at about 2800psi, I shot 10 shots from 555 fps up to 762 fps. It used a lot of air for 10 shots. I screwed the regulator in another 1/2 turn and repeated. This time averaged 545 fps with a spread of only 30. Another 1/2 turn in (now 1 1 1/2 total) without topping off the bottle yielded 10 shots at an average of 560 with a spread of 21. 2 1/2 turns in on the regulator and a fresh 2800 bottle resulted in 10 shots averaging 579 with a spread of 31.

I also changed the pellet probe o-ring with no discernible change in velocity. Half way through, the gun began firing on its own, so I learned how to adjust the sear engagement screw.

I am stumped - Is it possible the regulator isn’t working at all? My increasing the hammer spring tension by half it’s travel increased the velocity by about 100 fps, but if the hammer is hitting a full 2800 psi, maybe the valve barely opens and thus a low velocity. Is this possible?

Thx!
 
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I do not know. I’m guessing it likely was. There was evidence of some type of loctite type material on the mating surface of the hammer adjustment cover (although no anti-tamper plug). I bought it used from a guy who worked for Gamo when they owned BSA, so it is quite possible he got it as some type of demo, which makes getting a 12 ft lb version more likely. Even then, I think 12 ft lbs would be somewhere in the 750 fps range, making this one way low regardless.

On your regulator(s), how far below, or above flush with the housing is the Allen adjustment screw?
 
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Joe I cant answer that question cause I replaced my regulator with a huma. 

The regulator adjustment screw was a couple to three threads down from flush. I screwed it in another 1/2 turn. Starting with the tank at about 2800psi, I shot 10 shots from 555 fps up to 762 fps. It used a lot of air for 10 shots
Click to expand...

If I am understanding this sentence correctly it sounds like you have the regulator set to high. If your tank was at 2800 psi and the first shot was 555 fps and the next nine shots climbed to 762 fps it sounds like the reg set point is to high for the hammer spring. If you set the regulator high enough above the hammers energy the valve will be partially locked giving low velocity. As the pressure in the tank drops and the regulated pressure drops down to where the hammer has enough energy to open the valve more, the velocity starts climbing again. I would adjust the regulator back to where it was and keep the hammer spring adjustment the same as it is now. Check the velocity and see where its at. Post the results so we can see how it reacts.
 
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So below are two shot strings. The first is with the regulator at the “factory” setting and the hammer spring adjusted to half of the adjustable range. The first started at 2850psi and ended at 2400psi. The second is with the regulator adjustment screw 1 full turn counter clockwise, and started at 2800psi (I need to get my tank refilled) and ended at 2450psi. I don’t really thing there is a descearnable difference?

I also noticed the bolt now feels like it’s dragging on something when being pushed into battery - almost like if a grub screw was backing out or something

I get the feeling I’m either going to go for broke and learn how completely strip and repair this thing, spend at least $300 to have someone else fix it, or chalk it up to a lesson learned and sell it as a basket case. I paid $500, so I would feel ok spending a little bit on it.

Created: 02/06/19 14:14
Description: BSA, Starting Point, 2850 psi - 2400 psi
Notes 1: 
Notes 2: 
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 0.00
Temp: 36 °F
BP: 29.94 inHg
Altitude: 0.00
# FPS FT-LBS PF
70 606 0.00 0.00
69 611 0.00 0.00
68 623 0.00 0.00
67 595 0.00 0.00
66 599 0.00 0.00
65 606 0.00 0.00
64 612 0.00 0.00
63 594 0.00 0.00
62 595 0.00 0.00
61 599 0.00 0.00
60 602 0.00 0.00
59 587 0.00 0.00
58 588 0.00 0.00
57 607 0.00 0.00
56 587 0.00 0.00
55 594 0.00 0.00
54 589 0.00 0.00
53 590 0.00 0.00
52 595 0.00 0.00
51 586 0.00 0.00
50 579 0.00 0.00
49 586 0.00 0.00
48 576 0.00 0.00
47 598 0.00 0.00
46 571 0.00 0.00
45 596 0.00 0.00
44 572 0.00 0.00
43 587 0.00 0.00
42 579 0.00 0.00
41 581 0.00 0.00
40 580 0.00 0.00
39 563 0.00 0.00
38 572 0.00 0.00
37 575 0.00 0.00
36 562 0.00 0.00
35 569 0.00 0.00
34 566 0.00 0.00
33 563 0.00 0.00
32 557 0.00 0.00
31 ERROR 3
30 569 0.00 0.00
29 567 0.00 0.00
28 560 0.00 0.00
27 560 0.00 0.00
26 576 0.00 0.00
25 556 0.00 0.00
24 555 0.00 0.00
23 561 0.00 0.00
22 534 0.00 0.00
21 553 0.00 0.00
20 550 0.00 0.00
19 559 0.00 0.00
18 559 0.00 0.00
17 551 0.00 0.00
16 544 0.00 0.00
15 550 0.00 0.00
14 555 0.00 0.00
13 553 0.00 0.00
12 552 0.00 0.00
11 ERROR 3
10 555 0.00 0.00
9 533 0.00 0.00
8 541 0.00 0.00
7 543 0.00 0.00
6 547 0.00 0.00
5 538 0.00 0.00
4 541 0.00 0.00
3 545 0.00 0.00
2 529 0.00 0.00
1 542 0.00 0.00
Average: 571.7 FPS
SD: 22.7 FPS
Min: 529 FPS
Max: 623 FPS
Spread: 94 FPS
Shot/sec: 0.1
True MV: 572 FPS
Group Size (in): 0.00


Created: 02/06/19 14:37
Description: BSA, 1 turn counter, 2800 psi - 2450 psi
Notes 1: 
Notes 2: 
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 0.00
Temp: 36 °F
BP: 29.94 inHg
Altitude: 0.00
# FPS FT-LBS PF
50 594 0.00 0.00
49 603 0.00 0.00
48 600 0.00 0.00
47 594 0.00 0.00
46 596 0.00 0.00
45 591 0.00 0.00
44 579 0.00 0.00
43 587 0.00 0.00
42 588 0.00 0.00
41 585 0.00 0.00
40 570 0.00 0.00
39 592 0.00 0.00
38 591 0.00 0.00
37 577 0.00 0.00
36 578 0.00 0.00
35 572 0.00 0.00
34 575 0.00 0.00
33 570 0.00 0.00
32 568 0.00 0.00
31 570 0.00 0.00
30 566 0.00 0.00
29 589 0.00 0.00
28 567 0.00 0.00
27 570 0.00 0.00
26 565 0.00 0.00
25 560 0.00 0.00
24 554 0.00 0.00
23 567 0.00 0.00
22 565 0.00 0.00
21 570 0.00 0.00
20 555 0.00 0.00
19 558 0.00 0.00
18 566 0.00 0.00
17 558 0.00 0.00
16 560 0.00 0.00
15 554 0.00 0.00
14 555 0.00 0.00
13 544 0.00 0.00
12 549 0.00 0.00
11 553 0.00 0.00
10 550 0.00 0.00
9 560 0.00 0.00
8 546 0.00 0.00
7 542 0.00 0.00
6 538 0.00 0.00
5 541 0.00 0.00
4 543 0.00 0.00
3 540 0.00 0.00
2 537 0.00 0.00
1 544 0.00 0.00
Average: 566.9 FPS
SD: 18.2 FPS
Min: 537 FPS
Max: 603 FPS
Spread: 66 FPS
Shot/sec: 0.1
True MV: 567 FPS
Group Size (in): 0.00

 
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So heres what it looks like to me based on everything you have said and the results after adjustments. I am almost certain none of the fac models come with anti tamper. The shot strings after adjusting the hammer spring makes it look like you have a non fac model so it would be a sub 12 fpe setup. With an fac model and having the hammer spring set where its at you would be around 20 fpe. The shot strings are a little under powered being about 100 fps slower than you would expect. I know the sub 12 fpe rifles are generally set around 11 fpe. I dont know how far the sub 12 fpe hammer springs are generally adjusted for 11 fpe so you might keep the same reg setting and adjust the hammer spring in some more and see if it climbs closer to 700 fps. Also its possible someone put a lighter hammer spring in trying to set it up for an even lower power setting.

I wouldnt give up on it unless you just dont need/want the rifle. If it was mine and I got it for $500 I would dig into it and fix any bad parts and get it running like it should run. They are very accurate and nice rifles to shoot. I have worked on a few BSA rifles with one being the older S10. They are not hard to work on and its well worth it in my opinion. Try adjusting the hammer spring with the same reg setting and see how many shots and what velocity you can get. If you get to a point where velocity drops quickly give the reg a little turn to bring it up to match the heavier hammer energy. Maybe you can get it to 670 - 740 fps. If it reaches that point im gonna say its a non fac model. If it doesnt then start taking it apart and looking for damaged parts and repair as necessary.
 
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LDP,

Thanks for spending so much time trying to help me. I really appreciate it. I would like to keep the gun, as even when not working properly I like it’s overall feel better than my FX Wildcat. What do you make of the extreme spread of 94 fps? That’s what made me think the regulator might be bad, as it looked like the velocity was slowly increasing as the bottle pressure slowly went down. Other than eBay, what’s the best source of parts / o ring kits for the BSA line?

thanks again!
 
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the r10 has different transfer port sizes. that would be the first to check for me. if its not the biggest one, you can adjust the regulator and hammerspring to max or whatever and not much will change. for fac it needs to be 4-4,5mm in diameter. if its smaller, you just can use a drill (its just brass)

the pentagon F Stamped Models (thats on all german airguns if you got no special license) do have a tiny 1mm transfer port and even with a fac hammerspring the max fps are around 500 FPS.

i would recommend not to sell this gun because they have a great trigger, usually a good barrel and i like the stock :)
 
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Joe you are welcome. The strings look pretty flat until you get towards the end when pressure starts to drop. If thats the case it would show the reg setting is higher than the hammers energy has to fully open the valve. You want to have a very slight velocity increase when the rifle comes off the regulator to extend the shot string. I normally have it set around 10 fps of a climb. That way I still have a very small ES for my entire string. 

Looks like you got some more info to go on from the other guys. Keep pushing forward and you will have that R10 shooting tiny groups in no time. 
 
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