• Jefferson State Airrifles
  • Air Gun Web - Expert Airgun Reviews
  • Hajimoto Productions
  • Airgun Angie - Backyard Shooting
  • Nielsen Specialty Ammo
  • Dynamic Air Rifles
  • FX Airguns
  • DonnyFL - When silence is a priority
  • Airgun Archery Fun
  • Pyramyd Air
  • Saber Tactical
  • New England Airgun
  • Umarex Airguns
  • Contact us
  • Utah Airguns
  • SEKHMET Airgun Accessories
  • Freedom Gun Targets
  • Evanix Airguns at Airgun Pro Shop
Jefferson State Airrifles
Air Gun Web - Expert Airgun Reviews
Hajimoto Productions
Airgun Angie - Backyard Shooting
Nielsen Specialty Ammo
Dynamic Air Rifles
FX Airguns
DonnyFL - When silence is a priority
Airgun Archery Fun
Pyramyd Air
Saber Tactical
New England Airgun
Umarex Airguns
Contact us
Utah Airguns
SEKHMET Airgun Accessories
Freedom Gun Targets
Evanix Airguns at Airgun Pro Shop


Author Topic: PP750 Artemis Tear Down and Tune Up  (Read 11247 times - 2 votes) 
)

Offline mrbulk

  • GTA Senior Contributor
  • ******
  • Posts: 6181
  • Little things affect little minds” - Thoreau
  • Real Name: Charlie
Re: PP750 Artemis Tear Down and Tune Up
« Reply #120 on: September 29, 2020, 01:40:34 PM »
You guys are the worst enablers in the world!

(in a good way...) ;)
  • Las Vegas, NV, USA
Remember that none of this will matter in a hundred years. Have fun now.

Offline Warburrito

  • Plinker
  • **
  • Posts: 141
  • yes
  • Real Name: Dave
Re: PP750 Artemis Tear Down and Tune Up
« Reply #121 on: September 29, 2020, 07:27:13 PM »
I like the extra notches on the stock.  Always good to have options.
  • Brownsburg, IN, USA
SPA PP750 (arriving soon)
Crosman Quest SBD
Umarex Duke Colt SAA
Webley Tempest

Offline Back_Roads

  • I Got A 10 Pump BB Gun :) BB Guns Got Much More Complicated :)
  • GTA Senior Contributor
  • ******
  • Posts: 8957
  • 1st Edition Crosman 760 Pump Master
    • Back_Roads Airgunning
  • Real Name: James Seiler
Re: PP750 Artemis Tear Down and Tune Up
« Reply #122 on: September 29, 2020, 08:42:30 PM »
 I was thinking about notching mine a few inches from closed, to possibly work as a wrist brace in pistol mode.
  • Wisconsin Collins ;Hunters Paradise; Theres a Sign in town to prove it :)
(Sorry, but you are not allowed to access the gallery)

https://www.youtube.com/channel/UC3hMPAjvTtuu7DoNzBZzuKQ?view_as=subscriber
 Below is a collection of helpful airgun videos
https://www.youtube.com/playlist?list=PLASJo4rBxMImx-kNnbppkIBV86G5Yentf

Offline Thane

  • Airgun Mauler
  • Sharp Shooter
  • ****
  • Posts: 738
  • yes
  • Real Name: Thane
Re: PP750 Artemis Tear Down and Tune Up
« Reply #123 on: September 29, 2020, 08:45:53 PM »
The extra notches is a great start to making this gun exceptional since the stock scope mounting options are so limited and the original length of pull so long.

For short range/slower guns I like using smaller scopes and keeping the height as low and close to bore as possible. This keeps the shot flat and in Killzone over a longer range of distances. The magazine projects up basically locking the scope in one position, limiting fore and aft eye relief adjustments. So adjusting the stock distance is the compromise that works.

Adding a cheek piece locks out the twist in the adjustable stock, approaches fixed stock stiffness.
  • USA, CA, Dana Point

Offline bigHUN

  • Shooter
  • *
  • Posts: 76
  • Real Name: Attila
Re: PP750 Artemis Tear Down and Tune Up
« Reply #124 on: November 19, 2020, 12:25:52 AM »
I got my PP750 only couple days ago and right next day a very first surgery was done (deburring, polishing internals) and a very first oring is blown :).
Ordered some springs in couple different sizes (hammer and cocking and trigger control, you know).
Looking at that shroud (Canada here), to much empty space inside, my best guess to go for a 12" barrel, only not educated where to look for blanks? or older brakebarrel for parts? Me coming from Lego Impact, that aftermarket is well innovative.
Where to look for and what to look in for that 12" barrel?
  • Canada, L4G7X4

Offline bigHUN

  • Shooter
  • *
  • Posts: 76
  • Real Name: Attila
Re: PP750 Artemis Tear Down and Tune Up
« Reply #125 on: November 19, 2020, 01:00:57 AM »
...no regulator adjustments factory set point @ 122 bar.
...
...25 shots from 200Bar to 122Bar.

Thane, how do you measure the regulator pressure? Only recalculating from fill 200 bar to a drop to 122 bar? or you have a "device".
I cannot imagine attaching a little gauge only to redesign the "plenum" block.
  • Canada, L4G7X4

Offline Gerard

  • Sharp Shooter
  • ****
  • Posts: 697
  • Real Name: Gerard
Re: PP750 Artemis Tear Down and Tune Up
« Reply #126 on: November 19, 2020, 01:36:13 AM »
Looking at that shroud (Canada here), to much empty space inside, my best guess to go for a 12" barrel, only not educated where to look for blanks? or older brakebarrel for parts? Me coming from Lego Impact, that aftermarket is well innovative.
Where to look for and what to look in for that 12" barrel?

You might consider an LW barrel. It would take some machining, so depends on whether you can manage that or not. I ordered a blank in .22" for my QB78D a few years back. Took some cutting and refining to fit the receiver and develop an appropriate chamber, port it, cutting a nice crown, and threading for a muzzle brake, but was very much worth it on that rifle as accuracy was much improved. A Redman's .22" barrel liner might be another option if you wanted to epoxy on a carbon fibre tube over it. And there are the Crosman barrels of course. Scopes & Ammo have a selection of those:
http://scopesandammo.com/storefront/index.php/airgun-parts-custom-service-crosman-barrels-c-38_70
« Last Edit: November 19, 2020, 01:39:05 AM by Gerard »
  • Canada

Offline Thane

  • Airgun Mauler
  • Sharp Shooter
  • ****
  • Posts: 738
  • yes
  • Real Name: Thane
Re: PP750 Artemis Tear Down and Tune Up
« Reply #127 on: November 19, 2020, 03:21:49 AM »
I got my PP750 only couple days ago and right next day a very first surgery was done (deburring, polishing internals) and a very first oring is blown :).
Ordered some springs in couple different sizes (hammer and cocking and trigger control, you know).
Looking at that shroud (Canada here), to much empty space inside, my best guess to go for a 12" barrel, only not educated where to look for blanks? or older brakebarrel for parts? Me coming from Lego Impact, that aftermarket is well innovative.
Where to look for and what to look in for that 12" barrel?

11.5" barrel clears shroud about 3/4". No porting or lead work to do, but you will need to turn it down and thread to match thimble at least.
I repurposed a Hatsan barrel with very accurate results. A longer barrel can give you more power and efficiency over the 8" stock barrel.
  • USA, CA, Dana Point

Offline Thane

  • Airgun Mauler
  • Sharp Shooter
  • ****
  • Posts: 738
  • yes
  • Real Name: Thane
Re: PP750 Artemis Tear Down and Tune Up
« Reply #128 on: November 19, 2020, 03:27:26 AM »
...no regulator adjustments factory set point @ 122 bar.
...
...25 shots from 200Bar to 122Bar.

Thane, how do you measure the regulator pressure? Only recalculating from fill 200 bar to a drop to 122 bar? or you have a "device".
I cannot imagine attaching a little gauge only to redesign the "plenum" block.

Shooting a string with a chrono take note of the gun's pressure gauge when the velocity pitchs up, then drops or maybe just drops. Right before that the pressure gauge is reading the set point.
  • USA, CA, Dana Point

Offline bigHUN

  • Shooter
  • *
  • Posts: 76
  • Real Name: Attila
Re: PP750 Artemis Tear Down and Tune Up
« Reply #129 on: November 19, 2020, 09:57:03 AM »
Quote
...It would take some machining, so depends on whether you can manage that or not...

Yes I can manage machining, also have a micro mill for quick ideas and easy fixes, unfortunately no lathe on my own but have access.

Quote
You might consider an LW barrel...Redman's...Hatsan...Crosman....

Thanks, I need to look around which one I can get easier.

Looking into this little #66 block now, I have couple FX gauges from my LEGO gun laying around may have a good use for that. I would redesign/make that #66 bigger, missing some arca or picatinny rail on the pistol anyway I may combine together?
  • Canada, L4G7X4

Offline 7624452

  • GTA Senior Contributor
  • ******
  • Posts: 14646
  • Konservativ
  • Real Name: Alter Kriegshund
Re: PP750 Artemis Tear Down and Tune Up
« Reply #130 on: November 29, 2020, 02:18:04 PM »
I just purchased a trigger spring from Hawkeye51.  WTS ** Lighter trigger spring ** for the SPA pp750 - Airguns & Guns Forum (gatewaytoairguns.org)
It made the trigger feel much better and I tuned it down to 1lb 3oz.  :)
  • Hölle auf Erden
(Sorry, but you are not allowed to access the gallery)

Offline B.Guns.

  • Plinker
  • **
  • Posts: 265
  • yes
  • Real Name: Bryan
Re: PP750 Artemis Tear Down and Tune Up
« Reply #131 on: November 29, 2020, 03:14:27 PM »
Has anyone tried the Carm magazines yet? I know that they only hold 6 rounds in 22 cal.
Carm now has large capacity mags for the 750. They Hold 12 in .22 and 14 in .177. I haven't tried them yet but have a couple on order.
  • USA, CO, South Park
BSA r-10 MK2 .177
Benjamin Akela .22
PP 750 .22
AF TalonSS .22
DAR .22
Weihrauch HW77K SE .22
Benjamin Discovery .22
Custom 2240
CCS 2400KT .177
Beeman P17

Offline Thane

  • Airgun Mauler
  • Sharp Shooter
  • ****
  • Posts: 738
  • yes
  • Real Name: Thane
Re: PP750 Artemis Tear Down and Tune Up
« Reply #132 on: November 29, 2020, 05:52:00 PM »
Has anyone tried the Carm magazines yet? I know that they only hold 6 rounds in 22 cal.
Carm now has large capacity mags for the 750. They Hold 12 in .22 and 14 in .177. I haven't tried them yet but have a couple on order.

That is a great capacity increase. Let us know the dimensions beyond original mag, my scope is that close.
  • USA, CA, Dana Point

Offline SILENT SQUIRREL

  • Expert
  • *****
  • Posts: 1390
  • yes
  • Real Name: Edward
Re: PP750 Artemis Tear Down and Tune Up
« Reply #133 on: November 29, 2020, 06:29:35 PM »
Has anyone tried the Carm magazines yet? I know that they only hold 6 rounds in 22 cal.
Carm now has large capacity mags for the 750. They Hold 12 in .22 and 14 in .177. I haven't tried them yet but have a couple on order.

That is a great capacity increase. Let us know the dimensions beyond original mag, my scope is that close.

The CARM website indicates that the larger capacity PP750 magazines are 13mm taller than the others for the gun,  for a total height of 40mm

Here's the link

https://www.carm-magazines.com/high-capacity-carm-magazine-for-pp750-air-pistol.aspx

Ed
  • The other Washington
My pronouns: he, him, his

Offline B.Guns.

  • Plinker
  • **
  • Posts: 265
  • yes
  • Real Name: Bryan
Re: PP750 Artemis Tear Down and Tune Up
« Reply #134 on: November 29, 2020, 06:41:07 PM »
I had to measure but I think I'm good. I have one set of rings taller if not.
  • USA, CO, South Park
BSA r-10 MK2 .177
Benjamin Akela .22
PP 750 .22
AF TalonSS .22
DAR .22
Weihrauch HW77K SE .22
Benjamin Discovery .22
Custom 2240
CCS 2400KT .177
Beeman P17

Offline Thane

  • Airgun Mauler
  • Sharp Shooter
  • ****
  • Posts: 738
  • yes
  • Real Name: Thane
Re: PP750 Artemis Tear Down and Tune Up
« Reply #135 on: December 05, 2020, 03:29:16 PM »
Current scope centerline is 1.4" above bore, low as it will go over mag, only 1mm to spare.

Keeps near zero close, great advantage for 8- 30 yard shooting
  • USA, CA, Dana Point

Offline bigHUN

  • Shooter
  • *
  • Posts: 76
  • Real Name: Attila
Re: PP750 Artemis Tear Down and Tune Up
« Reply #136 on: December 06, 2020, 05:45:32 PM »
Wondering if this my rev.6 plenum block can double the shot counts ? :) sourcing tomorrow and hoping to get back with some numbers soon.



  • Canada, L4G7X4

Offline Thane

  • Airgun Mauler
  • Sharp Shooter
  • ****
  • Posts: 738
  • yes
  • Real Name: Thane
Re: PP750 Artemis Tear Down and Tune Up
« Reply #137 on: December 06, 2020, 06:51:01 PM »
Double would be great!

Looking forward to your strings
  • USA, CA, Dana Point

Offline PiotrBBurzy

  • Shooter
  • *
  • Posts: 3
  • yes
  • Real Name: Piotr
Re: PP750 Artemis Tear Down and Tune Up
« Reply #138 on: September 15, 2021, 09:12:46 AM »
HI It got quiet here.
So what I had done:
All ports opened /drilled
Pallet bridge 3.5mm OD to match diameter off channel in stock.
TP port drilled to 4mm OD I would recommend not to drill any bigger and keep slight angle or you will drill to outside.
I had polished hammer and popet / transfer port shaft. 1200 wet sanding.
Without touching regulator it brought me to 19.6~20.1 FT/LBS with 12 stable shots. with JSB 18.13grain

Now to work
I had turn regulator down to full turn and half.
still 420FPS bit to much for 6FT/LBS in UK, also lots of air still wasted.
Hammer spring consistently shortened one whole link tested at 40 shots series (from chrono I can tell my reg is about 70bar)
After 4 cuts I stared to see massive improvement.
Gun is incredibly quiet now I had gone 50 shots in 18.13g and I'm out off ammo now, gauge still on 180BAR.
I hope for nearly doubling shot count and fun.

I will order LW long barrel and mode/adjust to 350mm length, then I will bring it to 12FT/LBS.
I will keep it posted

 

 
 
« Last Edit: September 15, 2021, 09:15:28 AM by PiotrBBurzy »
  • UK, England, Watford

Offline Thane

  • Airgun Mauler
  • Sharp Shooter
  • ****
  • Posts: 738
  • yes
  • Real Name: Thane
Re: PP750 Artemis Tear Down and Tune Up
« Reply #139 on: September 15, 2021, 01:50:32 PM »
Nice tuning, especially with stock barrel!

I currently shoot at reduced power to 16.3 FPE for 55 shots averaging 635FPS using extended barrel with JSB 18.13, it's favorite pellet.

It is amazing the range of tune this little gun will support.
  • USA, CA, Dana Point