FWB Sport Review - Pre and Post Tune

Having accumulated a really nice collection of custom tuned underlever cocking HWs and TX200s, I decided I needed (?) one premium break barrel in my collection, just to see how it might compare to a fixed barrel, under lever cocking rifle. I have always believed that due to the lock-up, a break barrel could, at least in theory, never be as consistent. I don't know whether this is true or not, even after this experience.

After looking around, I decided to purchase a new .177 FWB Sport (see exhibit 1), based upon FWB's reputation for accuracy. I purchased it from Champions Choice and the service was excellent.

Upon receipt, unboxing, studying the owner's manual, and prepping the barrel, I put it through the paces shooting four different pellets using my indoor 18 yard range. As you can see by exhibit 3, the results were less than stellar, especially compared to what I am use to with my HW77, HW97, and TX200 rifles. I found the shot cycle to be really harsh, and the trigger only fair. It was also hard to get the pellets to seat properly.

After talking to Scott Schneider at Motorhead, I boxed the rifle up and sent it to him, as I have always had tremendous service from Scott. Scott's invoice indicated that the factory piston seal was too loose. He retrofitted and ARH seal designed for an HW 35 to replace it. He proceeded to de-burr everything, homed the compression tube and placed a liner in the piston spring's cavity and manufactured a one piece spring guide to fit the factory spring, polishing the spring ends. Scott polished the barrel throat to allow the pellets to seat better. He disassembled the trigger and stoned and polished the sear contacts.

The results can be seen in Exhibit 2, as the SD dropped from 12 to 16 FPS depending upon the pellet, to 4. The groups sizes diminished considerably. The rifle is very smooth to shoot now and the trigger is perfect. He did a great job with it.

I next tested six different pellets at 18 yards, with the results shown on Exhibit 2. The best three were the JSB Diablo RS 7.37, the Air Arms Diablo Field 7.87, and the AA Diablo Field 8.4. To really test consistency, I then shot five 10 shot groups of these pellets at 18 yards, with the results shown on exhibit 4.

Finally, I took the FWB to my 150 yard indoor range today, and shot 30 yard and 50 yard 10 shot groups to determine the best performing pellet, and then shot to POI every five yards from 20 to 55 to develop the range card I attached to the rifle. See Exhibits 5, 6, & 7.

My conclusions are as follows:

  • This is a beautiful rifle in all aspects, is well made, and is much lighter and better balanced than any other spring piston rifle I own, and will be a dream to carry in the woods compared to my 56TH and heavier springers.
  • It is sufficiently accurate to take any small game out to 50 yards. At 55 yards, the groups opened up beyond 2" with evening the best performing pellet.
  • This rifle will not produce the consistent tight groups that I have become accustomed to with my TX and HW series underlever rifles - but again, they are totally different rifles for different purposes, and will undoubtedly provide much enjoyment for years to come, filling a void in my collection in terms of cocking/loading design.
  • I would not have been happy with it had I not sent it to Scott for tuning. He improved its performance tremendously.

1 - FWB Sport Photo.1604288081.jpg
2 - FWB Sport Test Results.10.30.20.1604288081.jpg
3 - Out-of-Box Test Targets.09.24.20.1604288082.jpg
4 - 5.10 shot groups.7.37 Gr.7.87 Gr.8.4 Gr.10.30.20.1604288082.jpg
5 - FWB Test Results.Post Motorhead.JSB 7.37 Gr.11.01.20.1604288083.jpg
6 - FWB Test Results.Post Motorhead.AA 8.4 Gr.11.01.20.1604288083.jpg
7 - FWB Test Results.Post Motorhead.AA 7.87 Gr.11.01.20.1604288084.jpg











 
Having handled these NEW FWB Sporters a few times in the past couple years, tho never had the opportunity to take one apart and get to the bottom of what is lacking or strong suits either ? This rifle the OP is speaking of was my first ( Honestly and full transparency ) What I found was Very similar in design to the OLD 124/127 series sporters in term of piston architecture, barrel pivot and lock up with an indexing ledge. The biggest and most positive was the TRIGGER BLOCK being a vast improvement over models of the past. 



Greatest WTF's was that the spring guide was super sloppy to spring which for a company like FWB they should know better !! Second being the piston seal being minimally in contact with compression bore and DAMN NEAR able to slide off the head of piston .. Whoa sloppy sloppy sloppy FWB !!



In all a SUPER QUALITY gun with stellar machining quality. Fit and finish tight for those mechanical parts and pieces other than above mentioned.



IMO .. if they had the gun set up TIGHTER, no buzz, no rattles having spent just a tad more effort on the mentioned short comings they would have KNOCKED IT OUT OF THE PARK ! But for the High Price they were selling for when first introduced THEY STUMBLED big time in this regard.



Scott S
 
Late to this party... somehow missed this post when researching the FWB Sport. Thanks for posting these comprehensive results. Purchased my FWB Sport in late August 2022, agree with your conclusions in general. Wonderful gun. Have been home-tuning the gun, and am awaiting some custom parts for further tuning. Looking at your data, I see your post-tuned results are dramatically lower energy than original:

Air Arms Diabolo Field 8.4gr: 13.3 to 10.7 fpe, 20% reduction (velocity drop 87 fps)
H&N Field Target Tropy 8.64gr: 11.4 to 8.8 fpe, 23% reduction (velocity drop 110 fps)
Air Arms Diabolo Field Heavy 10.34gr: 12.5 to 10.8 fpe, 23% reduction (velocity drop 52 fps)
H&N Barracuda Match 10.65gr: 11.1 to 7.3 fpe, 34% reduction (velocity drop 128 fps)

These numbers are so far reduced, it seems logical the shot cycle would improve dramatically, especially with fitted spring guide and other expert tune-up (sear/spring ends/honed cylinder/etc). I'm curious why your energy output fell so far - did you shorten the spring? Did the energy climb back up with more shots through it?

This gun has a bigger power plant than the FWB 124, and is spec'd to put out over 13fpe (some report 14+ fpe out of the box). My tuned FWB 124's are putting out more energy than these numbers, with nice shot cycle and tight 10m groups (Maccari tune kit in one, AirVentures-tuned in the other). I wanted the Sport to be the gun that's "a little higher fpe than it's older brother, the 124" as designed, but still with great shot cycle. These numbers are making me wonder if that's a realistic goal, given this gun was professionally tuned by one of the top experts in the field.
 
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You will find the trend very similar among any spring piston air guns that comes from the factory running super loose internally.
With dang near no measurable friction from piston seal to comp bore, Spring supported to guide being non present the action will be VERY snappy and produce the most power .. generally, so long as piston seal is still sealing.
Set as such there is so much mechanical vibration happening it becomes very difficult having good accuracy & a low ES value. Seal may leak on a warm day and seal better when cold due the steel comp tubes expansion / contraction.
* Power claims are real enough because the guns make the most it can set as such ... just not realistic power if one is also wanting a calm and manageable shot cycle.

When we get a seal fitted that while a tad draggier, makes sure we're getting zero blow by and will by virtue of the more solid sealing a lower ES in most instances hot or cold.
Get the spring to follow a fitted guide with minimal rattling around with the ever important ( Chinese finger trap grab onto the guide ) just as piston is bottoming out kills secondary vibrations and coil bounce dead.

End result is that the drag created in both addressed issues takes away output power. While you can Ying & Yang fit tolerances based upon use or wanted results, There's no free lunch here in getting the best of both .. only compromise.