PP700 adventure started(Artemis PP700s-a)

[sawtoothscream]

Considered a dot again. My 2240 has one and I have taken a ton of Chipmunks,hospital and starling with that setup out to 30 yds.  Idk might just toss a rifle scope on and see if it's annoying or not in pistol form.    Think a 4x pistol scope would do the trick though

[Wayne52]

I was out once with mine this year and got a red squirrel with it.  I should take it out again soon.

[Thiel]

my pp700 was stored for a few months and now it became very loud (im limited to 5,5fpe and it was dead silent)
but im still in the limit. it has a huma reg installed and the stock regulator was just cranked up - worked fine for a few tins.

i removed the factory reg. adjuster and all washers, put 2 thick o-rings in and 2 washers on top and surprise, its NOT leaking.
with THAT professional modification it should not do anything or is it possible that its now just runing on a very low pressure setting ? im not sure if i have understood the stock regulator completly ?!
it looks for me more like a bleed valve with spring tension from the allen head adjuster and the washers ?!

right know i can push the striker by hand and release the air. its need a lot of force but it is possible.
is this possible with a reg setting around 60-80 bar ? (huma reg. should be at that range)

[Rallyshark]

my pp700 was stored for a few months and now it became very loud (im limited to 5,5fpe and it was dead silent)
but im still in the limit. it has a huma reg installed and the stock regulator was just cranked up - worked fine for a few tins.

i removed the factory reg. adjuster and all washers, put 2 thick o-rings in and 2 washers on top and surprise, its NOT leaking.
with THAT professional modification it should not do anything or is it possible that its now just runing on a very low pressure setting ? im not sure if i have understood the stock regulator completly ?!
it looks for me more like a bleed valve with spring tension from the allen head adjuster and the washers ?!

right know i can push the striker by hand and release the air. its need a lot of force but it is possible.
is this possible with a reg setting around 60-80 bar ? (huma reg. should be at that range)

It is possible your problem isn't with the factory parts or Huma.  It could be that the breech o-ring has gotten flattened for sitting for so long.  Try this:  Take you thumb and push on the breech block when firing, and see if it is quieter.  If it is quieter, then you are getting blow by on the breech o-ring where you load it.  With that low of a regulator setting, it doesn't surprise me that you can push on the hammer and make it release some air. 

Anyway, that breech o-ring is the first thing I'd check.

[Thiel]

hey,

that is a very good information!

i rebuilded my huma reg yesterday but i set it accidentally on a very low pressure. it was about 40-50 bar and the pp700 was DEAD quiete again and with a bit more preload on 5,5fpe again.
i set the reg higher and it has becoming loud again with not much more fps.

i think i have to check the breech o-ring 

thank you!

[Rallyshark]

Sounds like you're on the right track

[Thane]

Another folding stock...
Found on Evike made for 93R pistols. All metal construction and light, slides and locks in place, no fasteners. Machined a foot to match the real steal mounting points. Very quick to open with stiff locking in open and closed positions.  Length of pull is a bit too long with the UTG scope's eye relief, this is surprising given how compact it is. Removes quickley for pistol action, foot stays on and provides a bit a base. If I do a second round the base will be even wider, anything to increase the grip engagement.

[YEMX]

https://www.evike.com/products/26895/

Here's a link to that Airsoft folding 93R stock...  It took me a while to find it on Evike's site...  Not too shabby!!!  I like it!

[BSJ]

Nice looking stock!

https://www.epayments.co.uk/epages/es774039.sf/sece134ccb7a0/?ObjectPath=/Shops/es774039/Products/4409

The stock arrives today...

[BSJ]

Got it.

I was afraid it was going replace one of the metal grip spacers, but it uses both of them.

The attachment part is cast metal. The stock is injection molded. Heavier than I expected with the casting. But still light weight. Not heavy duty, for sure. But good enough...

[Wolverineshooter]

Brian, congratulations! Please let us know how your installation goes.

[BSJ]

The screw holes didn't quite line up with the grip holes. Had to ream the grip slightly.

Makes cocking a deliberate act. You have to push the hammer ever so slightly below the top of the stock. No more thumb cocking with the right hand...

And there's no gripping it or firing it right handed with the stock latched in the folded position. You have to open it and let it rest against your hand.

[Wolverineshooter]

I have been trying to make the PP700 regulator working for quite some time. Realizing it will not work like a regular regulator, now I have to lower my expectations. Looking back, I had some not so bad strings but at that time I was not happy about it.

After many failures I decided to start fresh by dumping all the air and move the regulator to its lowest setting, as Jason suggested in one post. Filling the air to 100 bar and let it sit over night and then fill to 220 bar. Interestingly, there is no air no matter what level of hammer spring I set. So at least the regulator is blocking air. works from that sense.

I turned the regulator up by 1/4 turn, still no air, another quarter turn, getting speed at 300s. another quarter turn, in 400s, another 1/8 turn in 500s after some hammer back and forth.
The problem is that the speed will climb up gradually, reaching 630fps around 120bar, like an unregulated gun.

I wonder if this is due to the small plenum, and this limit is removed when the regulator set point is passed? Not really sure what to make of it.

I know that if I raise the regulator set point, the speed will increase across the board. Based on my earlier testing if I raise the setpoint much higher I can get two umbrellas in the curve. So I may look to get two umbrellas with similar speed to settle down on this tune. Any insights and feedbacks are welcome.

[nervoustrigger]

Yeah it sounds like the regulator just isn't working.  The sealing surfaces are seating okay, judging by how it initially prevented air from reaching the valve until you put some preload on the Belleville stack to open the seat.

I haven't shot mine in a while but the last time I had it out, it was acting like an unregulated PCP.  Got a traditional bell curve over the chronograph:



It was regulating properly at one time so I don't know what happened, just haven't had the urge to tear into it again but I'm thinking about it.

Your comment about "two umbrellas" is very curious.  I have no idea how the regulator could behave in such a way as to give two bell curves.

I do recall mine not regulating reliably when I was attempting to use a low setpoint.  It seemed to get better when I increased it.  I really don't have a need for a 15fpe .177 so what I think I'm going to do is install the Bellevilles in a single series arrangement to halve the spring rate (bring down the adjustment range for the setpoint).  If I keep the height of the relaxed stack about the same, it will have more travel and theoretically a bit better linearity.  In other words rather than 5 pairs in series (( )) (( )) (( for 5 units of compression, I may instead have 7 singles in series () () () ( for 7 units of compression.  I haven't done the math to see if those amounts are about right, just trying to convey the idea.

[Wolverineshooter]

I will keep raising the set point gradually to see if I can reproduce the two umbrellas. I may also increase the wait time between the shots to see if that stabilize the curve. I always get 10-50fps higher speed when I sit down and record the speeds and pressure and then come back to shoot, than the subsequent shots.

Sorry to see you lost your tune on this gun, it could be frustrating. I had no experiences in adjusting the Bellevilles but that is the next thing I need to learn.

[Wayne52]

I should check mine too but I have the .22 and I've got the regulator turned up for about 16fpe last I checked.  Maybe I'll put some over the chrony with my cast pellets, they 23 grainers

[Wolverineshooter]

That would be great Wayne. I have the 22 as well

[nervoustrigger]

I always get 10-50fps higher speed when I sit down and record the speeds and pressure and then come back to shoot, than the subsequent shots.

Ah, that particular symptom indicates the regulator is creeping up...the pressure in the plenum is gradually climbing.  Mine was doing that originally until burnishing the valve seat components to each other (the white disc and tapered screw).  At least that's what I think fixed it; it's what has cured other regulators I've worked on.  BTW, the fact the velocity is up after a wait indicates the hammer spring is adjusted pretty strong.  Often times the symptom of reg creep is just the opposite...low velocity after a wait because if the hammer strike was adjusted just right, once the pressure creeps up, it's not enough to fully knock open the valve (i.e. partial valve lock).

[Wolverineshooter]

I varied the hammer strike, from the screw and bolt end being flush, to up to 3.5 turns(stronger). When it was flush I get much lower speed. The same for half a turn. from 1 turn to 3.5 turns the fps usually increase, not by much. I will upload the numbers later so you can see what I tried.

I had the same feelnig that the pressure is built up gradually, so for my next test I will wait for one minute between the shots. Hope that is enough time for the regulator to catch up, that way I could have a better sense of what hammer is doing.

[Thane]

This is my stock tuning experience and I think I experienced your "Double Umberella" this weekend tuning .177 box stock.

I started at the top with regulator all the way in and hammer at maximum, opposite of your starting point. It produced bell curves with no regulated flat velocity string. I then began backing out (CCW) the reg screw until a flat string began to occur at 1 3/4 turns out (green string).

Backed the reg out another 1/4 turn CCW and also reduced (CCW) the hammer 2 full turns Yellow String- Double Umberella maybe? definitely below the set point with some valve lock up front.

One turn up on the hammer (CW) produced 24 shots @4% (Pink String)

Wanting some more shots I backed out the hammer 1/2 (CCW) just below set point as it finishes with a velocity spike (minor double umbrella), but 40 shots at 4.4% spread and 10.3 FPE. I will shoot with this for a while as it shoots 812FPS with the H&N Terminators which holds a 1/2 zero to 34 yards.

I think there is a meeting with the dremel in the future.
I also think "Double Rainbow" is funnier than "Double Umbrella" ...