PS90 Owners I Need Your HELP!

Discuss rifles chambered for the 5.7x28mm; P90, PS90, and AR57.
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starfury
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Re: PS90 Owners I Need Your HELP!

Post by starfury » 23 Dec 2011, 14:02

I was finally able to confirm today that the PS90 rate reducer is made of machinable Tungsten HD17 (at 17gm/cc). I took the reducer out of my PS-90 and tested it on a Bruker XRF spectrometer (http://www.bruker-axs.com/handheldx-ray ... metry.html" onclick="window.open(this.href);return false;) at the office and sure enough the spectrum shows 90% Tungsten, ~7%Nickle and ~3% Iron, so it is slightly magnetic (no copper in the alloy). Also, there is no stainless steel clad – no spectrum ratios for the various types of stainless.

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Re: PS90 Owners I Need Your HELP!

Post by ddouglas » 23 Dec 2011, 16:30

What is a "rate reducer"?

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 24 Dec 2011, 00:55

starfury wrote:I was finally able to confirm today that the PS90 rate reducer is made of machinable Tungsten HD17 (at 17gm/cc). I took the reducer out of my PS-90 and tested it on a Bruker XRF spectrometer (http://www.bruker-axs.com/handheldx-ray ... metry.html" onclick="window.open(this.href);return false;) at the office and sure enough the spectrum shows 90% Tungsten, ~7%Nickle and ~3% Iron, so it is slightly magnetic (no copper in the alloy). Also, there is no stainless steel clad – no spectrum ratios for the various types of stainless.
Nice I already have the cad file for a heavier reducer. It will be just a matter of getting some of the Tungsten HD17 to my machine shop.
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Re: PS90 Owners I Need Your HELP!

Post by SoCal Gunner » 24 Dec 2011, 05:54

panzermk2 wrote:
SoCal Gunner wrote:Engrave one, sell it to me and I'll buy another raffle ticket!

We are about to send out case gauges to be laser engraved. I will send out about 10 of the weights and have them done.
:?:

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Re: PS90 Owners I Need Your HELP!

Post by starfury » 24 Dec 2011, 09:38

When you are looking, there are also machinable grades HD17.5, 18 and 18.5 which are heavier (1.5gm/cc for the HD18.5). - so by going with your new square design and a heavier alloy you can increase the weight by over an ounce.

http://www.mi-techmetals.com/hd-typical.htm" onclick="window.open(this.href);return false;

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Re: PS90 Owners I Need Your HELP!

Post by ddouglas » 24 Dec 2011, 09:45

I ask again: what is a "rate reducer"?

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Re: PS90 Owners I Need Your HELP!

Post by starfury » 24 Dec 2011, 09:50

It’s the cylindrical weight in the slot on the side of the bolt. By making it heavier (increasing the inertial mass of the bolt) it cycles slower. This can help for hotter loads allowing the bolt to stay in battery for slightly longer (letting pressure drop off) and reduce the magazine popping issues some are having.

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Re: PS90 Owners I Need Your HELP!

Post by ddouglas » 24 Dec 2011, 12:05

Ah ha! Thank you for the information.

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 24 Dec 2011, 14:18

ddouglas wrote:Ah ha! Thank you for the information.
In the FA P90 it sets the FA firing rate.
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 24 Dec 2011, 14:20

starfury wrote:When you are looking, there are also machinable grades HD17.5, 18 and 18.5 which are heavier (1.5gm/cc for the HD18.5). - so by going with your new square design and a heavier alloy you can increase the weight by over an ounce.

http://www.mi-techmetals.com/hd-typical.htm" onclick="window.open(this.href);return false;

It may be awhile though. This is our very slow session, yearly INS payment will be due and all the money I flushed having the prototypes made really put a dent in my R&D budget.
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 04 Jan 2012, 18:47

The first round of testing of a repair to the shaved off/mold issue where the receiver retention button sits have been completed.

As noted at the beginning of this thread some PS90's have shaved off polymer here on the foreword section of the opening making it easier for the receiver to pop out during firing and sometimes when the bolt slams foreword alone.
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Re: PS90 Owners I Need Your HELP!

Post by Cyberfly » 05 Jan 2012, 06:07

I'm curious how you repair damaged polymer? I doubt that a two part resin would hold with repeated use, especially such a small area that gets repeatedly abused like this one. Or are you looking at another way to correct the problem other than repairing the polymer?
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 05 Jan 2012, 15:32

Trying an epoxy resin. The problem is the polymer used was from the outset designed to be solvent resistant. Most epoxies are un able to get a bight into the polymer.
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Re: PS90 Owners I Need Your HELP!

Post by Cyberfly » 06 Jan 2012, 06:43

That's sort of what I was thinking. Even if you could rough it up to give it more of a surface area to bite onto, it still would have trouble holding simply bacause of the wear and tear that this particular area is subject to.
Good luck with it Jay, and keep us updated. Curious minds want to know...
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 06 Jan 2012, 07:19

Might look into a stronger spring for the take down button.
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Re: PS90 Owners I Need Your HELP!

Post by rcpd34 » 04 Jul 2012, 10:31

Subscribed with interest.

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Re: PS90 Owners I Need Your HELP!

Post by PursuitSS » 20 Jul 2013, 07:20

I ran across this on the "other" Forum:

http://fnforum.net/forums/f27/ps90-stock-46394.html

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 20 Jul 2013, 12:49

As you can see old news here. FNH supposedly changed their manufacturing process. I was told the reason this happens was related to how the workers remove the stock halves from the form weakening that area. I tried placing a metal clip in the much like our mag lip protectors but there is not enough clearance to allow for metal thick enough with withstand operation. The thickest clips I could fit in there would still shear in less the 20 rounds.


What needs to bee done is that seem should be moved off center and a stainless steel block molded into the stock.
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Re: PS90 Owners I Need Your HELP!

Post by PursuitSS » 20 Jul 2013, 13:10

panzermk2 wrote:As you can see old news here. FNH supposedly changed their manufacturing process. I was told the reason this happens was related to how the workers remove the stock halves from the form weakening that area. I tried placing a metal clip in the much like our mag lip protectors but there is not enough clearance to allow for metal thick enough with withstand operation. The thickest clips I could fit in there would still shear in less the 20 rounds.


What needs to bee done is that seem should be moved off center and a stainless steel block molded into the stock.
My .02, if someone (Elite) :D would offer a stronger takedown spring, I don't see how this damage could occur.

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 20 Jul 2013, 21:54

PursuitSS wrote:
panzermk2 wrote:As you can see old news here. FNH supposedly changed their manufacturing process. I was told the reason this happens was related to how the workers remove the stock halves from the form weakening that area. I tried placing a metal clip in the much like our mag lip protectors but there is not enough clearance to allow for metal thick enough with withstand operation. The thickest clips I could fit in there would still shear in less the 20 rounds.


What needs to bee done is that seem should be moved off center and a stainless steel block molded into the stock.
My .02, if someone (Elite) :D would offer a stronger takedown spring, I don't see how this damage could occur.

Tried it and it still does. Not enough room in there for a spring strong enough to make a difference. I have another fix that can be applied to bad stocks but have not had enough time to throughly test it.
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Re: PS90 Owners I Need Your HELP!

Post by Buffman » 20 Jul 2013, 23:10

yeah that's TMH's stock. He stated that happened after firing some of the EA ammo I had sent him. Mine has not had that happen, but mine pops the mag up on most EA's stuff except S4M and T6

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 21 Jul 2013, 09:35

Buffman wrote:yeah that's TMH's stock. He stated that happened after firing some of the EA ammo I had sent him. Mine has not had that happen, but mine pops the mag up on most EA's stuff except S4M and T6

They really needed to make the P90/PS90 a delayed blow back. Besides a stock fix I have messed with that but like other things I just run out of time in a day.
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Re: PS90 Owners I Need Your HELP! (JB WELD epoxy)

Post by Litehiker » 30 Sep 2013, 19:56

How about renewing the forward edge of the reciever lock hole with JB WELD epoxy?

That stuff is actually more wear resistant than the the PS 90 polymer stock.

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Re: PS90 Owners I Need Your HELP! (JB WELD epoxy)

Post by panzermk2 » 01 Oct 2013, 09:17

Litehiker wrote:How about renewing the forward edge of the reciever lock hole with JB WELD epoxy?

That stuff is actually more wear resistant than the the PS 90 polymer stock.

Crumbles after first shot tried that years ago.

Clip like the ones used on the old style magazine lips can't be made thick enough to not break, not enough clearance between stock and receiver.

I am testing a fix by just cutting the section out and replacing it with an aluminum insert. Securing it has been the issue.
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Re: PS90 Owners I Need Your HELP!

Post by techspec » 31 Mar 2014, 22:47

Was looking at my ladies PS90 and realized something. Her Duracoat in that region is holding up against the punishment that section takes pretty well. It's not even removed the finish yet. If it ever does, I'll just hit it with another coating. Seems that by cleaning the poly stock with the Duracoat degreaser, it allowed the duracoat to bond pretty well. Makes for a pretty good extra layer of protection. I was leaving my PS90 black, but maybe I'll put a coating of midnight black on mine to give it a lil extra protection too.

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Re: PS90 Owners I Need Your HELP!

Post by Litehiker » 25 May 2015, 16:54

Would it not be much simpler (and less costly) to increase the spring rate on the magazine catch?

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Re: PS90 Owners I Need Your HELP!

Post by Buffman » 25 May 2015, 17:52

Litehiker wrote:Would it not be much simpler (and less costly) to increase the spring rate on the magazine catch?
Yes, Jay offers a tougher mag release spring.

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 25 May 2015, 22:52

http://www.eliteammunition.net/p90ps90/ ... pring.html" onclick="window.open(this.href);return false;
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Re: PS90 Owners I Need Your HELP!

Post by rusTORK » 07 Dec 2015, 14:10

Hello everyone.

I am new on this forum and i am looking for help.

I want to make for airsoft gas blowback version of P90 TR (made by manufacturer called WE) plastic sticker with FN marking. Your may see it on left side of body, it's saying: "Fabrique Nationale Herstal BELGIUM". Somehow WE didn't made it and airsoft version don't have markings at all. It's look fine overall, it's still P90, but this kind of small details make it more real and cool.

What i have got so far:

1. Exact marking text (Fabrique Nationale Herstal BELGIUM);
2. Size of niche on airsoft P90 TR for marking;
3. Exact font used for marking on P90\PS90;

I am looking for:

1. Scan (or high resolution photo) from top of a marking;
2. Size of niche on PS90 (just to compare airsoft P90 TR and PS90).

Scan is ideal for marking. It will give me exact coordinates of each letter and with with high resolution plus exact font i may do it clean and easy.

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Re: PS90 Owners I Need Your HELP!

Post by rusTORK » 04 Feb 2016, 13:31

I still looking for help with my problem. Anyone?

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