PS90 Loose Muzzle Device

Discuss rifles chambered for the 5.7x28mm; P90, PS90, and AR57.
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Fractal
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PS90 Loose Muzzle Device

Post by Fractal » 30 Jan 2018, 06:36

I have a PS90 SBR. Lately I noticed the muzzle device, in this case an A2 style flash hider, was loose. I can easily unscrew it with my hand so it does work it's way loose during firing.

When I contacted the manufacturer of the SBR, he mentioned that the manual says to torque down the muzzle device to 30 ft./lbs. I re-read the PS90 manual very carefully and could find no such mention.

Does anyone know if 30 ft./lbs. is the correct torque setting? Should it even be torqued at all beyond hand tight?

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panzermk2
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Re: PS90 Loose Muzzle Device

Post by panzermk2 » 30 Jan 2018, 10:59

My concern is that he P90/PS90 barrel is SUPPOSED to have play in it.

Who did the work cutting the barrel and/or who supplied the barrel?
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Fractal
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Re: PS90 Loose Muzzle Device

Post by Fractal » 31 Jan 2018, 09:46

It was TROS; however, the barrel does have play... it's the flash hider that I can unscrew with my hand. Are you supposed to torque down a PS90 flash hider? If so, is 30 ft./lbs. is the correct torque setting?

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panzermk2
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Re: PS90 Loose Muzzle Device

Post by panzermk2 » 31 Jan 2018, 12:18

I just wanted to make sure it was not the barrel. YES 30 pounds will work. I would put BLUE loctite on it. That way it will still come off WHEN you want it but not before.
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Fractal
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Re: PS90 Loose Muzzle Device

Post by Fractal » 05 Feb 2018, 08:37

I have your standard torque wrench with a 3/4" socket, but the socket doesn't fit all the way over the flash hider to reach the nut. Is there a special socket one uses, or an alternative method of reaching 30 ft./lbs. I'm not aware of?

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Rapier1772
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Re: PS90 Loose Muzzle Device

Post by Rapier1772 » 05 Feb 2018, 11:45

Would a deep socket work? I haven't tried it, just asking... Or you could use a crows foot wrench, kind of like these
https://www.harborfreight.com/7-piece-3 ... 94427.html
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panzermk2
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Re: PS90 Loose Muzzle Device

Post by panzermk2 » 05 Feb 2018, 12:00

Use a claw foot.
Jay Wolf
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Fractal
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Re: PS90 Loose Muzzle Device

Post by Fractal » 06 Feb 2018, 18:13

Amazing! Didn't know those existed! Gonna scoop me up a set!

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