Any US importers carrying this gun?

[Rat Sniper (AKA: PaulT58)]

Thank you!  Still not sure I fully understand what I need to do...  Maybe it will make more sense once I have it opened up.  Thanks again for the link!

[nervoustrigger]

Umm, Ok, did you mean that if it maxes out at 950, to adjust down to .97 x 950 = 920

The 850fps was just an example.  Your 950fps example is a perfectly fine approximation.

right now the regulator has one half turn (180 deg.) counterclockwise on it   The hammer spring has been shimmed by 0.1 inch.

should I adjust the regulator ?  increase ? decrease ?
should I add more shims to the hammer spring ?

Best strategy depends on your goal.

Adjusting the hammer spring preload is usually the easiest so I like to start there...increase it until the velocity plateaus (maxes out).  If it's not where I want it, my options are to adjust the regulator or adjust the porting.

If the velocity is lower than I want, I will consider increasing both the porting and the regulator setpoint.  If the porting is anemic--say, 50% of bore diameter--I'll open it up to 75% or 80%.  That's about max for the barrel port, any bigger and pellets may dip into the port on loading and get damaged (if you want larger than that, the port needs to be oval).  If it's already already in the vicinity of 75% of the bore diameter, I'll move on to the regulator.

If instead the velocity is higher than I want, I will reduce the regulator setpoint.  Not much reason to reduce the porting on a regulated rifle...unless you can do it on the fly with a restrictor screw or similar feature.

In either scenario, the follow up step is adjust the hammer spring preload and find the plateau, then back down to about 97% of that.

I would imagine that I should (like you said) set the regulator adjuster and then add shims to the hammer spring until the FPS maxes out, and then remove hammer shims until I get 0.97% of max velocity.

Correct!

At that point, if I dont get the velocity I'm after, adjust the regulator again, and then add/delete hammer shims until max, then remove to 975.  A very iterative process.

Usually not that much trial and error involved.  If you were trying to take a 600fps rifle up to 900fps, yeah it might take several iterations to get there.  If your target is 950 and you're at 850, you can probably get there in a couple of attempts.

I think first I'll adjust the barrel port, then go from there.

Nothing wrong with starting there.  Try enlarging it to around the 75% mark.  For .22 cal, you can get close with a 5/32" or 11/64" (standard fractional sizes) or a #20 numbered bit.  Just bear in mind there may be other restrictions in the path that need to be dealt with so if you have the valve out at some point, take a close look at it as well. 

I'm attaching at little spreadsheet that you can plug your numbers into and see where the restrictions are:

[superchikn]

Thank you!  Still not sure I fully understand what I need to do...  Maybe it will make more sense once I have it opened up.  Thanks again for the link!

Paul, I replaced all three of my trigger screws with the ball bearing tipped ones shown in the pic.  As they are longer and are set screws they allow more travel (adjustment).  The ball bearing tip should also be an improvement over a rounded screw.

 Three screws are not required as one one at the rear of the trigger marked 4 and shown at position 1 in the schematic, is a dust cap.  The trigger needs to be removed to access the hex recess in the dust cap and unscrew it.  At this point you can either replace it with a longer screw or you may be able to swap it with the # 2 screw (if it is long enough).  I installed the longer set screws in position  1 and 2 so I could experiment.

So far I have not figured out if I can use both for a two stage trigger.  The #3 screw at the front of the trigger needs to be replaced to adjust the trigger position unless you have large hands.  I adjust the #3 screw to position the trigger to a comfortable position and then turn the screw at #1 position until I can no longer cock the gun then back it off just enough to cock reliably.
I put a lighter spring under the trigger but it did not make a great difference.

[superchikn]

Jason,
Thank You for the tuning tutorial, I have been wondering what my next steps should be and now I have a direction.  Greatly appreciated.

[Abefroman]

Jason,
Thank You for the tuning tutorial, I have been wondering what my next steps should be and now I have a direction.  Greatly appreciated.

Hey Superchikn - what 6-24 x 50 scope are you using on your Nova Liberty ?  I've got a 6-24 x 50 CVLife scope on my .22 gauntlet from amazon ($38) and I love them.  I recently bought a discovery vt-z 6-24 x 44 and I'm on the fence whether I like it or not.

cheers

[superchikn]

Jason,
Thank You for the tuning tutorial, I have been wondering what my next steps should be and now I have a direction.  Greatly appreciated.

Hey Superchikn - what 6-24 x 50 scope are you using on your Nova Liberty ?  I've got a 6-24 x 50 CVLife scope on my .22 gauntlet from amazon ($38) and I love them.  I recently bought a discovery vt-z 6-24 x 44 and I'm on the fence whether I like it or not.

cheers

Yup its one of those from Amazon.  I think it is Bestsight.  I love it for $40.  I have the same one on my XS60-C as well but a different name.

Mine focus sharply at full power.
I have a UTG 4- 16 x 50 and a Hammers 4-12 x 40 of which neither focus as sharply as my $40 scopes let alone at full power.

[AVS Stephen]

Sorry but I've been obsessed with the thumb hole stock. Almost done just have to finish the wood with Tru-Oil. Video will follow if you want to make one.

[Rat Sniper (AKA: PaulT58)]

Sorry but I've been obsessed with the thumb hole stock. Almost done just have to finish the wood with Tru-Oil. Video will follow if you want to make one.

That looks amazing!  I'm looking forward to your video, but I'm afraid I don't have that kind of talent, even with a how-to video!  Awesome job!

[cosmic]

SWEET !!!!

[darkcharisma]

That looks real good. Please make a video I would like to see the process and one day tackle that job. Wow! I might have to laminate red oak...don't know if redoak is good for stocks. Where do you get wanut?

[cosmic]

Trigger shot is about the 50 minute mark.. Steve does a great job on showing it....

[cosmic]

This is the nsa 15.5 slug  removed from chamber on my .177.. Maybe the barrel is to tight for them... The flattened nose is from removal...

[kzz1kaw]

Thank you!  Still not sure I fully understand what I need to do...  Maybe it will make more sense once I have it opened up.  Thanks again for the link!

What size length are the ball tipped set screws? Any pics? Where did you buy them ? Would like to order some. Good mod idea👍🏾😎
What size length are the ball tip set screws? Any pics of them ? Where did you get them
Paul I replaced all three of my trigger screws with the ball bearing tipped ones shown in the pic.  As they are longer and are set screws they allow more travel (adjustment).  The ball bearing tip should also be an improvement over a rounded screw.  Three screws are not required as one one at the rear of the trigger marked 4 and shown at position 1 in the schematic, is a dust cap.  The trigger needs to be removed to access the hex recess in the dust cap and unscrew it.  At this point you can either replace it with a longer screw or you may be able to swap it with the # 2 screw (if it is long enough).  I installed the longer set screws in position  1 and 2 so I could experiment.  So far I have not figured out if I can use both for a two stage trigger.  The #3 screw at the front of the trigger needs to be replaced to adjust the trigger position unless you have large hands.  I adjust the #3 screw to position the trigger to a comfortable position and then turn the screw at #1 position until I can no longer cock the gun then back it off just enough to cock reliably.
I put a lighter spring under the trigger but it did not make a great difference.

[kzz1kaw]

Sorry but I've been obsessed with the thumb hole stock. Almost done just have to finish the wood with Tru-Oil. Video will follow if you want to make one.

You did an amazing job on the stock😳👍🏾

[kzz1kaw]

Thank you!  Still not sure I fully understand what I need to do...  Maybe it will make more sense once I have it opened up.  Thanks again for the link!

What size length are the ball tipped set screws? Any pics? Where did you buy them ? Would like to order some. Good mod idea👍🏾😎
What size length are the ball tip set screws? Any pics of them ? Where did you get them
Paul I replaced all three of my trigger screws with the ball bearing tipped ones shown in the pic.  As they are longer and are set screws they allow more travel (adjustment).  The ball bearing tip should also be an improvement over a rounded screw.  Three screws are not required as one one at the rear of the trigger marked 4 and shown at position 1 in the schematic, is a dust cap.  The trigger needs to be removed to access the hex recess in the dust cap and unscrew it.  At this point you can either replace it with a longer screw or you may be able to swap it with the # 2 screw (if it is long enough).  I installed the longer set screws in position  1 and 2 so I could experiment.  So far I have not figured out if I can use both for a two stage trigger.  The #3 screw at the front of the trigger needs to be replaced to adjust the trigger position unless you have large hands.  I adjust the #3 screw to position the trigger to a comfortable position and then turn the screw at #1 position until I can no longer cock the gun then back it off just enough to cock reliably.
I put a lighter spring under the trigger but it did not make a great difference.

[kzz1kaw]

Superchiken screwed up the quote what size length set screws? Where did you buy them ? Any pics? That’s is a good mod that I want to do to mine and other airguns I own. Good tip👍🏾😎

[kzz1kaw]

This is the nsa 15.5 slug  removed from chamber on my .177.. Maybe the barrel is to tight for them... The flattened nose is from removal...

That does look too tight😳 glad you posted a pic have some nsa 15.5 slugs as well to try out in some of my 177. If I’m understanding correctly did you push a slug thru the barrel and out I’m assuming the barrel is choked ?

[superchikn]

Superchiken screwed up the quote what size length set screws? Where did you buy them ? Any pics? That’s is a good mod that I want to do to mine and other airguns I own. Good tip👍🏾😎

Here you go:  https://www.gatewaytoairguns.org/GTA/index.php?topic=149431.msg1553370#msg1553370

[cosmic]

No it was just chambered and pushed out... I switched the one screw behind the trigger to the very back one.. (dust cover) adjust till it just trips the sear and then back off till you like it..

[kzz1kaw]

Superchiken screwed up the quote what size length set screws? Where did you buy them ? Any pics? That’s is a good mod that I want to do to mine and other airguns I own. Good tip👍🏾😎

Here you go:  https://www.gatewaytoairguns.org/GTA/index.php?topic=149431.msg1553370#msg1553370

Thank you😎