GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: skorec on October 14, 2018, 10:47:24 AM
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Yesterday I have purchased Walther 1250 at caliber .177.
Before it comes at home I am trying to find any tuning info:
1. Haw to fine the trigger ?
2. Haw to enlarge transfer port ?
3. Haw to increase firing air pressure from 125bar to 170bar ?
I welcome all experiences .
https://www.youtube.com/watch?v=c6szk9uM3bg (https://www.youtube.com/watch?v=c6szk9uM3bg)
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Search for info on the Hammerli 850 airmagnum. Basically the same gun only co2 but many converted it to HPA. Tons of tuning info out there on it.
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Know some folks here have worked with them, and a lot of folks have used the co2 or HPA converted CO2 versions. Add in the newer Thor and Rotec, and they've got a lot of miliage from the same basic action (yeah..some changes...but it's the same action).
I've not owned a 1250, but have had a little trigger time with one....and have owned the co2 850, another 850 converted to HPA tanker, and a more recent co2 12gr. wood stock version.
Triggers all seem about the same. Not bad, but I'm pretty immune to triggers. Know there were some posts about the trigger system, which should be about the same on the Dominator as the other versions. Most of the power-ups posted for the HPA conversions likely would point you in the right direction even though the ones I've read were not 1250-specific (but if it worked for one, would work for another).
So the good news is that a lot of mods have already been tried (although for lower pressure than you envision). Can likly search out the posts about those other rifle's trigger tweaks, power changes, and figure out how to apply them to the 1250.
Mags are the same for all of them...simple inexpensive mags, but won't cycle with a pellet longer than about .38". That'snot bad news for a .177 shooter, as that's pretty lone (like 21gr. Piledriver long) for .177 pellets.
Mag is a little picky about some pellets rattling back and forth (depending on the shape of the pellet and where the o-ring on the mag contacts them). Which makes some long sub-diameter in the center pellets kind of "rattle". Which is no big deal,unless one rattles forward, sticks out the end of the mag, and jams the rotation.
Good luck with the rifle...once you get it and shoot it, THEN figure out what it needs....may be less than you think.
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I'm guessing the 1250 has an LW barrel? My Rotek had LW also. I hated that gun for a couple reasons but will say that it was a tack driver. Hammer bounce was unbearable though. The trigger wasn't that bad actually but the fact that umarex said the Rotek came with an adjustable match grade trigger irked me. NOT adjustable and NOT match grade lol. Rotek specific parts were impossible to get, not sure if its the same with the 1250?
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The trigger on the right is an aluminium aftermarket one i bought in germany,it can be adjusted to obtain something similar to a two stage playing with the single adjustement screw present on the rifle,a little better than the plastic one,
The transfer port is a long 6mm hole in the action,not easy accessible due to a hard steel ball pressed in,let it alone,something can be done swaging the lower barrell port for better flow.
The regulator is in the valve body,to access the belleville springs you must loose a two flats brass nut and unscrew the steel rear part,be careful,the parts are hard glued in and not easy to loose.
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Know some folks here have worked with them, and a lot of folks have used the co2 or HPA converted CO2 versions. Add in the newer Thor and Rotec, and they've got a lot of miliage from the same basic action (yeah..some changes...but it's the same action).
I've not owned a 1250, but have had a little trigger time with one....and have owned the co2 850, another 850 converted to HPA tanker, and a more recent co2 12gr. wood stock version.
Triggers all seem about the same. Not bad, but I'm pretty immune to triggers. Know there were some posts about the trigger system, which should be about the same on the Dominator as the other versions. Most of the power-ups posted for the HPA conversions likely would point you in the right direction even though the ones I've read were not 1250-specific (but if it worked for one, would work for another).
So the good news is that a lot of mods have already been tried (although for lower pressure than you envision). Can likly search out the posts about those other rifle's trigger tweaks, power changes, and figure out how to apply them to the 1250.
Mags are the same for all of them...simple inexpensive mags, but won't cycle with a pellet longer than about .38". That'snot bad news for a .177 shooter, as that's pretty lone (like 21gr. Piledriver long) for .177 pellets.
Mag is a little picky about some pellets rattling back and forth (depending on the shape of the pellet and where the o-ring on the mag contacts them). Which makes some long sub-diameter in the center pellets kind of "rattle". Which is no big deal,unless one rattles forward, sticks out the end of the mag, and jams the rotation.
Good luck with the rifle...once you get it and shoot it, THEN figure out what it needs....may be less than you think.
Thanks a loooooot I have canceled the order before shiping .
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Maybe a good idea Peter,i had much fun converting and tuning my 850 and it is still up and running,but nowaday there are much better "tuner friendly" options around at the cost.
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First had the care of a 850 co2 for 13 weeks while the owner was off on a temp. contract (psyc. nurse). HATED the 88gr. cartridges but felt like there was something here I really liked.
Picked up one of my own once he returned from that contract, but wanted to dump the 88gr. AirSourse tanks. Loved my 850 co2 one I converted to a 9ounce co2 tanker.
(http://i157.photobucket.com/albums/t50/ribbonstone/co2/IMG_2398_zps3faa6c27.jpg) (http://s157.photobucket.com/user/ribbonstone/media/co2/IMG_2398_zps3faa6c27.jpg.html)
Count it as a mistake on my part converting it to HPA. Worked, but really didn't care for it all that much. Lucky for me, another shooter thought it was just what he was looking for and I sold it.
Problem with trying the HPA conversion is that you seem to want power. The 13ci (and 22ci) bottles (1) need to run though an adaptor to fit the 88gr. fitting on the action and (2the bottles are rated at 3K pressure. So to have any air to run on, would have to be regulated to soemthing like 130-150 BAR...that's not a lot of pressure range (200bar to 150bar isn't a whole lot of air unless that tank is one of the 22CI versions). Can certainly get that running fast, just not fore a pot full of shots.
Git to shoot a 1250,which I belive was out-the-box (but broken in) stock. Sure felt like the same trigger to me.
Recently had the urge for one once again, and noticed that at that time Airgun Depot had some 12gr. running versions. Considering the only paintball filling shop with folks with normal IQ's closed (and the only local options were dimwits), I'd become a 12gr.fan
Can think of it as a Rotec or Thor stock, dual 12gr. tube, same barrel/same actiojn/same trigger. Not a powerful .177 co2, but a surprisingly accurate one.
(http://i157.photobucket.com/albums/t50/ribbonstone/co2/c1f62f2f-7e38-4aca-ab0e-0322359caef6.jpg) (http://s157.photobucket.com/user/ribbonstone/media/co2/c1f62f2f-7e38-4aca-ab0e-0322359caef6.jpg.html)
Been running this pretty close to out-the-box stockfor the last 5-6 months, so I've had no reason to take it apart and see what's different. Sooner or later,somthing is foing to take a dumpon me and I'll have to get it apart..and when I do, will post whatever I notice that's different from all the other rifles running on this basic action.
MAYBE that you were right to cancel the order....trigger will never be truely match-grade, the tuning of the rifle is not external (you'll be taking it apart to get to the parts you need to "futz" with)., and getting to the treansfer tunnel (the part between the tansfeer port seal and the valve) isn't a lot of fun.