Baddaboom

bump

bump

Oh sorry, forgot to say! Stockport

FX Crown MKII .177 Huma Custom 380mm shrouded X-twist superior barrel .177 Huma Expanded transfer port fitted Huma Gauges fitted (original OEM gauges included) Custom Hydro Dipped Stock Custom Hydro-Dipped Huggett Moderator Custom adjustable stock riser (mandatory if using with large scopes or any digital scope) 20 MOA Picatinny top-rail (mandatory for use with digital scopes such as the Arkens/Pards/Hik’s etc) Tuned at 11.8 ft/b with JSB Heavies 10.3 Grain. Hard Case with foam inserts included. x1 Magazine with swappable Internals, 21 shot original pellet (red) and 18 shot custom pellet & slug version (red) Includes x1 fill probe Gets 350+ shots per fill @ 250bar (due to Huma internals) Pellet on pellet accurate at 50+ yards Likes QYS, JSB’s for pellets and H&N for slugs. A few scratches here and there. It has been a working gun, but a loved and well maintained gun which has accounted for more rats, pigeons and crows than I can remember. This has not been a ‘safe queen’ sat with its o-rings rotting. Recent full service by myself when I installed the Huma Gauges, major o-rings replaced. Needs require me to sell to fund a new car. Reluctant sale. (Scopes & mounts in image/s not included) £850.00 No offers, Bank transfer only Face to face preferred, All viewings welcome. Postage considered, £30 (Next day signed for, fully insured, Parcelforce) Payment in full must be made before any postage of item. Attachments

I can't see any visible creep in regards to the reg gauge.

If i switch to medium I get a slightly lower fps and more inconsistent reading, If i go to low fps drops by about 150 fps

Oh, and thankyou for your help and suggestions, It's very much appreciated

The hammer spring system is a fully adjustable unit, the wheel turns on the outside of the gun up and down. Obviously you need your max number on the wheel to be 12ft/b so it can't 'easily' be turned up to go over. No the gun doesnt have a shot curve. the reg is working, as the crown has an outside regulator gauge that resets after each shot like it's supposed to. I have to select the large TP on the TP dial. If i selected small and tuned to 12ft/b, then plod could come alot, turn the wheel two points and it would be going massively over - same issue as with the HST wheel. ALL need to be on max and putting out 12ft/b

I have refitted the Hammer spring system and turned the HST down by three clicks on the side dial on the crown, and it's now doing well, a SD of 2 again and a steady 11.7 ft/b. Not a clue as to why it decided to jump up without me touching it so that now i have had to turn it down three clicks for it to go back again. I'm going to leave the gun in a cold room and then come back to it when it's cold and see if the velicty has changed.

Hiya Ultrastu, Thanks so much for your comment. My hammer spring mechanism including the spring looks fine. I run it without lubrication. How would I check the valve? Do you know if a reg replacement on the crown is do-able?

Hello, I don't think I quite explained it properly. Adding the Huma transfer port was a mod I installed a long time ago, it's a fantastic mod and has nothing to do with power but air conservation. I previously had a tune which produced 11.8ft/b, for a long time. This is with the Huma transfer port. The recent mad ES/SD, which appears to have been taking me over the limit on a limited number shots, is a recent event/occurrence, unrelated to the transfer port. That's why I believe it may be a regulator issue, or perhaps due to a bad batch of pellets with inconsistencies in weight. Also, you'll note as I have removed the hammer spring system, that my rifle is not an illegal air rifle as it is not assembled or functional. I am seeking measures via this post to make sure that once I assemble it again and set the reg/HST up, it will be mechanically stable to stay under the 12ft/b limit. I hope this clears it up and answers your questions. If anyone would like to comment further with helpful advice rather than unhelpful lauding, It would be very much appreciated.

Anyone?

@logunator Perhaps you could advise, my learned friend?

Extra: I have bought some QYS 9.56 grain pellets to see if they produce a better and more consistant velocity/fps - if it still has this issue with those then i'll know it's not the pellets but an issue with the reg.

Hi All, I have a FX Crown MKII .177 -it's about 3 years old. It's only modification is I put in the Huma expanded transfer port as a friend had a spare one and also put in Huma guages. (edit for clarity: I installed this mod a long time ago and with it, achieved my very consistent 11.8ft/b tune which is documented in the imagery below. It has nothing to do with my current issues) I'm now getting inconsistent velocities. Please see image below with the 50 shot string. The chrono readings with the 2.2 SD were after i'd tuned previously (months ago) using the 95% method, but documented at this point in time to show the 11.8ft/b tune. The 50 shot string with the 6SD & 25fps variation was after leaving the gun for a few hours, to document the disparity after leaving the gun. You'll notice at this point it is going over 12ft/b for a few shots (one shot is 12.6!) - due to ... well, whatever the issue is! I have made the gun inoperable by removing the whole hammer spring system. It goes without saying but I am aiming for a tune below 12ft/b and in no way wish to modify my rifle to be over 12 ft/b in any way, shape or form. Thought: I did switch to a new tin of pellets around this point, the same brand and type (JSB Heavy 10.34 grain 5.52) Could this be that I have a bad batch of pellets, with some being lighter than others? I have a feeling it could also perhaps be an issue with the regulator. Is there any easy way to remove the reg and clean it? Thankyou all.