PS90 HD Bolt Rate Reducers.

Discuss rifles chambered for the 5.7x28mm; P90, PS90, and AR57.
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panzermk2
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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 13 Apr 2012, 17:01

First run of 25 are being made now.
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Wackamole
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Re: PS90 HD Bolt Rate Reducers.

Post by Wackamole » 14 Apr 2012, 04:05

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PursuitSS
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Re: PS90 HD Bolt Rate Reducers.

Post by PursuitSS » 14 Apr 2012, 07:54

Wackamole wrote:Does the bolt rate reducer help in any way with SBR'd PS90s?
I would also like to know this.

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Re: PS90 HD Bolt Rate Reducers.

Post by old fool » 14 Apr 2012, 19:12

Only if it can slow down your finger. :laugh:

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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 14 Apr 2012, 21:03

Yes but the benefits are less since the bolt assembly was designed for the P90 first. One of the things you need to watch on the P90/SBR is the bolt cracking on the edge of the face. You need to make sure to change your recoil springs.
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Re: PS90 HD Bolt Rate Reducers.

Post by Wackamole » 16 Apr 2012, 11:39

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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 16 Apr 2012, 12:59

Wackamole wrote:To the heavier recoil springs, correct?

Or factory springs. If you don't change the factory springs the 100% factory bolt will crack.
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Re: PS90 HD Bolt Rate Reducers.

Post by PursuitSS » 16 Apr 2012, 18:35

panzermk2 wrote:
Wackamole wrote:To the heavier recoil springs, correct?

Or factory springs. If you don't change the factory springs the 100% factory bolt will crack.
How often do they need to be changed?

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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 17 Apr 2012, 00:21

PursuitSS wrote:
panzermk2 wrote:
Wackamole wrote:To the heavier recoil springs, correct?

Or factory springs. If you don't change the factory springs the 100% factory bolt will crack.
How often do they need to be changed?
Now there is the rub. I can't give you the number. FNH does not give one. I have the OEM FNH PS90 Maintenance Manual and no where in it do they list a round count or a way to measure. Based purely on other springs 10k would be a good starting point.
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Re: PS90 HD Bolt Rate Reducers.

Post by Wackamole » 17 Apr 2012, 02:08

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Re: PS90 HD Bolt Rate Reducers.

Post by Zhurdan » 17 Apr 2012, 06:09

panzermk2 wrote:
Wackamole wrote:To the heavier recoil springs, correct?

Or factory springs. If you don't change the factory springs the 100% factory bolt will crack.
Now you've got my curiosity up. Are you saying that an SBR'd PS90 with factory bolt and no modifications needs different springs to prevent cracking or am I reading you wrong?

I can also read what you said as "if you don't keep good/maintained springs in it, it may crack (weak springs). Is that due to bolt bounce as the springs get weaker?

I'd hate my investment to go to crap.

Thanks in advance.

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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 17 Apr 2012, 11:29

OK I thought I made it pretty simple.

The bolt will crack on a P90/PS90 if you don't replace the recoil springs when they get worn out.

Exact details where not passed on to me. I was hoping to get pics but I did not.

I would suspect that since this is a blow back gun, worn out springs will not hold the case in the chamber long enough to allow pressures to drop.


Why you guys extrapolated that into "I'd hate my investment to go to crap." is beyond me. ALL firearms need their recoil springs changed at sometime or another and when you don't ANY firearm would be damaged buy this.
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Re: PS90 HD Bolt Rate Reducers.

Post by Zhurdan » 17 Apr 2012, 11:48

Sorry for asking a question. I just thought I would utilize your expertise rather than just "hope" I read it correctly.

My bad.

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Re: PS90 HD Bolt Rate Reducers.

Post by Wackamole » 18 Apr 2012, 02:56

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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 18 Apr 2012, 13:03

Wackamole wrote:If the issue is with the bolt retracting prematurely before the chamber pressure reduces to a safe level, it should be noted that, with a suppressor attached to an SBR’d PS90, the same conditions could exist do to backpressure from the suppressor. Based on this (assuming the previous statement is true), if one uses a suppressor on an SBR’d PS90, replacing the factory springs to the heavier springs, and possibly also adding a bolt rate reducer, might be prudent. I’m just sayin’……

Depending on the can this has been an issue in the past. Some cans do cause the magazine to pop loose and in some cases the receiver to pop out.
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Re: PS90 HD Bolt Rate Reducers.

Post by Wackamole » 19 Apr 2012, 03:32

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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 19 Apr 2012, 08:59

Wackamole wrote:Hmmmmm...... Could the use of a suppressor on the Five Seven pistol also allow for the extraction of the spent shells before pressures have dropped to a safe level?

No shorter barrel.
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Re: PS90 HD Bolt Rate Reducers.

Post by Kinoons » 30 Apr 2012, 09:53

It appears I shall be needing one of these as well.

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Re: PS90 HD Bolt Rate Reducers.

Post by panzermk2 » 25 May 2012, 13:50

In stock just picked up from laser engraver will be up on the website next week.
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Re: PS90 HD Bolt Rate Reducers.

Post by Llagoud » 04 Jun 2012, 06:06

Nice. Tomorrow is 'theoretical payday'.
:laugh:
If my numbers look good I'll get my order in. :thumb:

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