Author Topic: PP750 Artemis Tear Down and Tune Up (Read 35276 times))

Thane · « **Reply #80 on:** September 11, 2020, 04:12:41 PM »

There have been reports of poor functioning magazines, my .177 worked great and the .22 not usable.

The .22 mags would catch each pellet, jamming as it bit into each pellet. Opened up the mag and found that the port had not been de-burred or relieved in anyway.

Putting a slight chamfer on the port, polish and operates flawless now.

bear air · « **Reply #81 on:** September 11, 2020, 08:25:35 PM »

Good to know! Thanks Thane.

Thane · « **Reply #82 on:** September 14, 2020, 05:12:49 PM »

Bling for the PP750 in .22 and going more organic than the aluminum hex cells on the .177.

Sourced some stabilized blanks on Etsy. These are Banksia pods with an opalescent blue/black resin that has quite a bit of fire in sunlight.

The hand feel is very good, a bit of texture, thicker section and ambidextrous thumb/finger ledge. Additional DIY photos for those interested, can't wait to see what you guys come up with when deliveries are made.

B.Guns. · « **Reply #83 on:** September 14, 2020, 05:20:27 PM »

That looks great Thane!! You should make some up for us less skilled people to buy.

Hawkeye51 · « **Reply #84 on:** September 14, 2020, 07:02:54 PM »

Thane

Awsome grips. I looked on Etsy for the first time, wow a million choices. How thick were your blanks, to give you enough room for a thumb rest & finger grooves?

Thane · « **Reply #85 on:** September 14, 2020, 07:41:43 PM »

Thanks, Mine are 3/8". 1/2" was my first set on .177, took a bit of thinning. 1/4" is too thin for a thumb shelve.

Blank sizes 5" x 1 3/4" x 1/4" for OEM sized scale.

To get out around the trigger with thumb shelves 5 1/2" x 2" x 3/8".

Etsy has an enormous amount, so does Ebay. Just verify overall size, some scales are small.

bear air · « **Reply #86 on:** September 14, 2020, 09:02:06 PM »

Those grips are awesome! I would buy a set pre fabricated that looked that good. DANG!

mrbulk · « **Reply #87 on:** September 14, 2020, 09:36:01 PM »

Quote from: bear air on September 14, 2020, 09:02:06 PM

Those grips are awesome! I would buy a set pre fabricated that looked that good. DANG!

+1...

Thane · « **Reply #88 on:** September 17, 2020, 04:18:47 AM »

So I had a 19" spare .22 barrel, turned and threaded it for the thimble, shot some strings.

I expected the much greater barrel volume (19" vs. stock 8") would starve the available plenum slowing velocity. Then I could cut down 1 inch see how much the speed increased, repeat until matched barrel volume to available plenum...

Nope, it picked up 13.5 FPS per additional inch of barrel, on high power tune ( 2100 PSI set, max hammer with 3.5 gram brass slug).

So now it's doing 32 FPE with JSB Heavy 18.13 gr for 19 shots 888FPS, punching way above it's weight class! Same 2100 psi settings push FX Hybrid slugs 22gr at 830 FPS / 33.6 FPE. Or 1,740 psi set point for 30 shots @ 815 FPS 26 FPE.

I will thread for LDC, add shroud and shoot as a true carbine for a while, see how it holds groups.

Hawkeye51 · « **Reply #89 on:** September 25, 2020, 01:56:18 PM »

Thane

I just polished up my washers in the regulator. When they came out they were not how I expected. Do you remember the sequence for your 22 cal? ))) (((((( )))

Thanks in advance.

Thane · « **Reply #90 on:** September 25, 2020, 02:30:19 PM »

My .22 was the same as .177 )))((()))(((.

While your in the reg, take a pick and careflully drag the interior cylinder. Mine had lathe cuts you could feel. A light sanding with 1,000 oxide paper wrapped around wooden dowel flattened it smoothing the reg and opening the range.

Hawkeye51 · « **Reply #91 on:** September 25, 2020, 03:07:22 PM »

Thane

Thanks buddy, I'll do that. Loving the pistol!!

Hawkeye51 · « **Reply #92 on:** September 25, 2020, 03:13:51 PM »

Did you happen to count the turns to get it near factory setting?

Thane · « **Reply #93 on:** September 25, 2020, 05:50:04 PM »

Quote from: Hawkeye51 on September 25, 2020, 03:13:51 PM

Did you happen to count the turns to get it near factory setting?

I disassembled my first PP750 reg without marking setting. Took several setting changes to find range again as entire range is less than 1 turn.

It is near brass flush with body. I now mark it with punch.

Hobbyman2007 · « **Reply #94 on:** September 25, 2020, 08:15:40 PM »

Wow , that’s some serious power but not exactly a pistol any longer. Now we know that the valve train in the neat little gun will in fact Take to mods very well. I wish they made a rifle version of this one so I could play with it.

Back_Roads · « **Reply #95 on:** September 25, 2020, 08:28:53 PM »

Quote from: Hobbyman2007 on September 25, 2020, 08:15:40 PM

Wow , that’s some serious power but not exactly a pistol any longer. Now we know that the valve train in the neat little gun will in fact Take to mods very well. I wish they made a rifle version of this one so I could play with it.

Well I am still having a blast with mine shooting 500 FPS

Thane · « **Reply #96 on:** September 26, 2020, 03:59:15 PM »

Quote from: Hobbyman2007 on September 25, 2020, 08:15:40 PM

Wow , that’s some serious power but not exactly a pistol any longer. Now we know that the valve train in the neat little gun will in fact Take to mods very well. I wish they made a rifle version of this one so I could play with it.

Power is there, even with a minuscule plenum.

The long barrel was to find performance limits, very accurate and terrible in the hands.
I have now cut it down to 11.5", which is the full shroud length plus 1/2 20 threads for LDC, much better.

At 11.5" it can make 25FPE with 790FPS using 18gr pellets for 22 shots/3mags.

My preferred tune is 20 FPE at 710FPS for 31 shots. This tightens my groups to 1/4" ctc at 25 yards. The added weight in the front helps.

Thane · « **Reply #97 on:** September 26, 2020, 07:00:31 PM »

It is a thick barrel.

Hawkeye51 · « **Reply #98 on:** September 27, 2020, 01:07:39 AM »

After several attemps I ended up setting the regulator around 115 bar. Using a chopped off rounded bolt head I made a hammer weight with caveman tools, and flattened the spring end. I opened the passage & the valve to 4mm and shaped the flow, polished the regulator washers & smoothed the walls. I replaced the trigger spring with a lighter one, and polished the action, sear, and trigger screws. I was able to adjust the pull to about a pound or less and still retain the function of the safety.

Thank you Thane, for leading the way. I now have a really smooth pistol with a great trigger. With the hammer spring backed all the way out, I get 35 shots @700 fps (Crosman domes) and another 5 between 680 & 695. I still have plenty of room to up the hammer spring, or the regulator, but for my backyard pesting, this is perfect.

The pp750 is a great platform, easy to work on and understand. It's not bad right out of the box, but with a little tweeking and TLC, it feels down right refined. I love this little guy, and it is quickly becoming one of my favorite open sight (red dot) pistol/carbines.

Has anyone tried the Carm magazines yet? I know that they only hold 6 rounds in 22 cal.

kkarmical · « **Reply #99 on:** September 27, 2020, 08:54:16 AM »

Quote from: Hawkeye51 on September 27, 2020, 01:07:39 AM

Has anyone tried the Carm magazines yet? I know that they only hold 6 rounds in 22 cal.

I picked up a pair to test out, and couldn't be more satisfied. Never really cares for the style that came with the gun, and being so small, just add to my dislike.
The Carm magazines are a much better design imo, and work flawlessly, at some point I'll pick up a couple more.

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PP750 Artemis Tear Down and Tune Up

Author Topic: PP750 Artemis Tear Down and Tune Up (Read 35276 times))