FWB124 scope issue

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radform

Member
Jul 11, 2018
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FL
Looking for some help with a frustrating problem. I have an FWB 124 that I just had overhauled and tuned by a respected air gun smith. Before the overhaul, I had an older Burris 4-12 compact AG/RF scope on the rifle in an RWS C-Mount. I honestly never liked the scope and mount and was looking to upgrade it. I bought a BKL 260 one piece droop correcting mount - highly recommended for the 124- and mounted the Burris in it.

When I tried to sight the rifle in at 20 yards the POI was a good 24 inches low and 18 (or more) inches left. Maxing out the elevation and windage I could only get the POI to about 6 inches low and left of POA. Went back home, disassembled everything - checking to confirm that I had the mount pointed the right way (I did) - optically centered the scope, then reassembled it and tried again. Got the same results on the next trip to the range.

I called BKL and they had two recommendations: check that the mount was oriented correctly (already done) and also check to confirm that the scope wasn’t bottoming out in the rings and contacting the mount. Since the fit under the turrets was very close to the mount I decided to shim (carefully) both rings to raise the scope height enough to confirm the scope turret assembly wasn’t contacting the mount. Back to the range - and same results again. Extremely low and left again and even maxing out elevation and windage I couldn’t move the POI to the aim point.

I’m not sure what to try next. I don’t have another springer rated scope to try and I sold the C-Mount. Appreciate any ideas.






 
Well, are you certain your received the BKL-260D7 One piece droop mount and perhaps didn't accidentally get a BKL-288 one piece adjustable mount in the box? That might explain it both of windage and elevation adjustments being way out of whack. The 260D7 does have 24moa at 100yrds of compensation however that doesn't account for 24inches at 20yrds unless my math is off.

Beyond that I am not sure, I know the bkl's use a sort of pinching motion when you tighten the ring caps and as such there tends to be a bit of side to side play in the saddle which can allow the scope to rotate laterally slightly as you tighten the rings. I've seen it happen to some of my scopes and that causes a windage poi shift although eighteen inches sounds pretty extreme.

Not sure if you mentioned but did you try putting the rws mount back on after trying the bkls to see if the poi comes back to where you expect it be?
 
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Thanks for the replies - I still haven’t solved the issue. I got a laser bore sighter and tried it with the Burris in the BKL mount. Using it just confirmed the results I saw at the range. I couldn’t adjust the elevation or windage to the laser spot - with the elevation and windage maxed up and right the laser spot was still low and left.



Just to check another scope, I put a Leopold compact 2-7x in the BKL on the rifle. I could adjust the crosshairs to the laser spot on the Leupold, though i had to put more right windage in than I would have liked (not maxed out though). Since the Leupold isn’t air gun rated, I’m not going to try shooting it, but I think I may try to pick up another springer rated scope to try.
 
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I use leupold scopes on all my AG's, and have for decade's, including my FWB 124 & 127. Never had one fail. And I only use standard sportsmatch rings.

As mentioned above, check your breech seal. It may be sticking out to far causing barrel droop. It should be just barely sticking out (proud) beyond the breech face.

Good luck

Airguntunes
 
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