PS90 Owners I Need Your HELP!

Discuss rifles chambered for the 5.7x28mm; P90, PS90, and AR57.
User avatar
panzermk2
Forum Supporter
Posts: 11552
Joined: 19 Aug 2008, 15:51
Location: Around here it's more like what can we shoot through next.
Contact:

PS90 Owners I Need Your HELP!

Post by panzermk2 » 08 Jul 2011, 12:48

Ok gyus here is the thing.

We all know there are some sensitive PS90's out there. I currently have one in the shop that has been acting up since the owner bought it even before it ever fired EA ammo. Owner did buy used so no telling what was done to it before. Actually it's hardly had ANY EA ammo through it since it loves to pop the mag and pop the receiver on it's own with factory SS195.

Now I only have 3 stocks to compare to in the shop. This is where I need forum members help. Anyone with a decent camera and a PS90 can you take some pictures of the area below. All I need to know is whether it has worked fine or been a PIA PS90.

This one I have, in these pictures seems to have a great deal more of the polymer stock shaved off in this area. Heck if you let the bolt ride foreword on the recoil spring it will pop loose. I want to see a larger sample to check for a trend here. If there is one I will look into some sort of fix like I came up with for the FsN magazines.

Image


Image

Image
Jay Wolf
Pr. Elite Ammunition

"Engineers, the oompa-loompas of science!"

Be'ein Tachbulot Yipol Am Veteshua Berov Yoetz
Image

Buffman
Silver Member
Posts: 2883
Joined: 12 Jan 2009, 22:48
Location: SW Michigan
Contact:

Re: PS90 Owners I Need Your HELP!

Post by Buffman » 08 Jul 2011, 13:45

I will have my wife take pictures of mine. I've fired just about all of your loads from my FSN, and the only one I had trouble with was two of those BBS's you send me. both of them half popped the primer and the case stuck in the bolt.. S4M, S5, T6, P6, Ill, Pro, all have been fine.

fzr confused
Senior Member
Posts: 1117
Joined: 10 Sep 2008, 14:33
Location: south fl
Contact:

Re: PS90 Owners I Need Your HELP!

Post by fzr confused » 08 Jul 2011, 14:56

i will try and take pics tonight, but i am not that great with the camera :(

Buffman
Silver Member
Posts: 2883
Joined: 12 Jan 2009, 22:48
Location: SW Michigan
Contact:

Re: PS90 Owners I Need Your HELP!

Post by Buffman » 08 Jul 2011, 15:37

Image
Image
Image
Image
Image
Image

Buffman
Silver Member
Posts: 2883
Joined: 12 Jan 2009, 22:48
Location: SW Michigan
Contact:

Re: PS90 Owners I Need Your HELP!

Post by Buffman » 08 Jul 2011, 16:29

More:

Image

Image

Image

Image
Image

fzr confused
Senior Member
Posts: 1117
Joined: 10 Sep 2008, 14:33
Location: south fl
Contact:

Re: PS90 Owners I Need Your HELP!

Post by fzr confused » 08 Jul 2011, 16:34

how many rounds of EA's stuff does it normally take to pick up on this problem? is it right away or a gradual over time issue? round count on mine is 1500-2000 of ss197's with not a single problem (minus the cheap korean POS mag problem i had). i have also fired 50 S4's and 50 penatraTOR's again with not a single problem.

Image

Image

Image

Image

Image

Image

Image

i tried to get the flash into the opening to show the plastic better, but idk how well that helped.

User avatar
panzermk2
Forum Supporter
Posts: 11552
Joined: 19 Aug 2008, 15:51
Location: Around here it's more like what can we shoot through next.
Contact:

Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 08 Jul 2011, 19:41

Most happen right away. If you look you can easily see that on both your PS90s the polymer has a nice square edge at the bottom without any angle to the polymer. I think I may have figured out something.

I have the first set of bolt weights on my hands and we are testing them. You want to have some fun? Try bluing with 4140 the SS factory reducer. It wont take the blueing at ALL! Cheaper SS will still take some blueing due to traces of carbon. Now take this SS reducer and stick it to a magnet. It will stick.

The reducer is made of an exotic magnetic stainless steal. Fun stuff and friggin expensive.
Jay Wolf
Pr. Elite Ammunition

"Engineers, the oompa-loompas of science!"

Be'ein Tachbulot Yipol Am Veteshua Berov Yoetz
Image

User avatar
panzermk2
Forum Supporter
Posts: 11552
Joined: 19 Aug 2008, 15:51
Location: Around here it's more like what can we shoot through next.
Contact:

Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 08 Jul 2011, 19:53

In these pics you can see how much is missing.


Image

Image
Jay Wolf
Pr. Elite Ammunition

"Engineers, the oompa-loompas of science!"

Be'ein Tachbulot Yipol Am Veteshua Berov Yoetz
Image

Buffman
Silver Member
Posts: 2883
Joined: 12 Jan 2009, 22:48
Location: SW Michigan
Contact:

Re: PS90 Owners I Need Your HELP!

Post by Buffman » 08 Jul 2011, 20:59

wowser.. 17-4 is a stainless that's magnetic. We typically run a lot of our valves and seats at work out of 17-4 H900 (heat treated to 900 degrees)

fzr confused
Senior Member
Posts: 1117
Joined: 10 Sep 2008, 14:33
Location: south fl
Contact:

Re: PS90 Owners I Need Your HELP!

Post by fzr confused » 09 Jul 2011, 09:38

Think it was shaven down extra while being made or from removing the barrel over time?

User avatar
iFire
Senior Member
Posts: 545
Joined: 22 Jan 2010, 06:42
custom title: FsN | PS90

Re: PS90 Owners I Need Your HELP!

Post by iFire » 09 Jul 2011, 12:10

I have two 90's - One with a modified mag catch spring and one with the stock spring.

The modified gun works perfect while the stock gun will pop the mag from time to time. The increased tension of the heavier spring on the mag catch will prevent the mag from ever popping up. IMO that is the problem, and the new spring solves it.

The solution (in my mind) is exactly what I did to my modified gun... increase the mag catch spring tension!

viewtopic.php?p=150503#p150503" onclick="window.open(this.href);return false;

This modified mag catch spring in conjuction with EA's extra power magazine spring have made the gun completely reliable... I wouldnt go back to a stock set-up ever again! :thumb:

User avatar
panzermk2
Forum Supporter
Posts: 11552
Joined: 19 Aug 2008, 15:51
Location: Around here it's more like what can we shoot through next.
Contact:

Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 09 Jul 2011, 12:39

I am having HD mag catch springs made but I am working on a complete solution.
Jay Wolf
Pr. Elite Ammunition

"Engineers, the oompa-loompas of science!"

Be'ein Tachbulot Yipol Am Veteshua Berov Yoetz
Image

ninthinning
Gold Member
Posts: 239
Joined: 20 Dec 2009, 10:59

Re: PS90 Owners I Need Your HELP!

Post by ninthinning » 10 Jul 2011, 06:26

My two PS90s are 25,000 apart in serial number and perform identically. When they were stock the magazine would not pop with new 195 or 197. Both guns popped the mags 2% when using old powerful 195. With hand loads the problem became ridiculous. When I weighted the bolt both guns performed better. Even with weighted bolt the mag pops when I start loading in the upper limits of the 5.7 x 28mm. The improved spring in the mag release looks promising.
9th

Image

Image
Last edited by ninthinning on 10 Jul 2011, 09:43, edited 1 time in total.
God bless John Browning.

Grantness
Senior Member
Posts: 4677
Joined: 19 Aug 2008, 09:13
Location: Virginia

Re: PS90 Owners I Need Your HELP!

Post by Grantness » 10 Jul 2011, 07:16

I'd send it in to FN and mention nothing about the EA going through (cause i seriously doubt it has nothing anything to do w/ the issue). Best case, they replace it... Worst case, they fix it... But I guess, since you're the one working on it and might run into the same problem in the future it'd be nice to figure out exactly what's wrong...
Last edited by Grantness on 10 Jul 2011, 14:34, edited 1 time in total.

ninthinning
Gold Member
Posts: 239
Joined: 20 Dec 2009, 10:59

Re: PS90 Owners I Need Your HELP!

Post by ninthinning » 10 Jul 2011, 10:50

Maybe a stronger set of hammer springs would help hold the bolt closed a little longer?
God bless John Browning.

User avatar
panzermk2
Forum Supporter
Posts: 11552
Joined: 19 Aug 2008, 15:51
Location: Around here it's more like what can we shoot through next.
Contact:

Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 10 Jul 2011, 13:19

The stronger mag catch springs are a great way to go. You will see them first since our first run of redesigned rate reducers where a total fail.

They fit perfectly problem is magnetic stainless steel is substantially heavier then all other forms of SS. What you see here is just under 1 thousand dollars of fail. These 10 prototypes weigh about the same as the factory reducer. So now I have 10 paper weights. I am working with my machinist on a comparable carbon steel. That will cost another 500 bucks, So before selling a single one I am already into these simple rectangles of metal 1500 bucks not counting my time.

Image

Image

Image
Jay Wolf
Pr. Elite Ammunition

"Engineers, the oompa-loompas of science!"

Be'ein Tachbulot Yipol Am Veteshua Berov Yoetz
Image

ninthinning
Gold Member
Posts: 239
Joined: 20 Dec 2009, 10:59

Re: PS90 Owners I Need Your HELP!

Post by ninthinning » 10 Jul 2011, 14:27

I am really looking forward to trying the heavy mag release springs. Your solution to the chipping FiveseveN magazines is ingenious.
9th
Last edited by ninthinning on 12 Jul 2011, 03:28, edited 2 times in total.
God bless John Browning.

Grantness
Senior Member
Posts: 4677
Joined: 19 Aug 2008, 09:13
Location: Virginia

Re: PS90 Owners I Need Your HELP!

Post by Grantness » 10 Jul 2011, 14:36

is it not possible to magnetize certain types of steel either yourself or cheaply...or does that wear off? I take it you aren't working on anything cool for the AR57....


....I know, I know, only 1 thing at a time (or in your case 10 things). :laugh:

You seriously need to relocate out of Illinois, I'd prob work for minimum wage if you'd let me :D

User avatar
panzermk2
Forum Supporter
Posts: 11552
Joined: 19 Aug 2008, 15:51
Location: Around here it's more like what can we shoot through next.
Contact:

Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 10 Jul 2011, 15:42

The machine shop I use now is interesting. They are big but not too big. They have about 25 guys running machines. I have an in with the owner.


We don't pay min around here. I pay shop help 10 bucks an hour 1099 and no benefits other then lots of fun at the range.
Jay Wolf
Pr. Elite Ammunition

"Engineers, the oompa-loompas of science!"

Be'ein Tachbulot Yipol Am Veteshua Berov Yoetz
Image

Grantness
Senior Member
Posts: 4677
Joined: 19 Aug 2008, 09:13
Location: Virginia

Re: PS90 Owners I Need Your HELP!

Post by Grantness » 10 Jul 2011, 15:48

I just said that cause if you love what you do, you never have to work a day in your life. ....and that sort of thing I would almost do for free. Only thing is I couldn't live in a state where you can't carry and corruption is the status quo....

/sorry 'bout the drift.

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests