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Q&A for Dead Air Armament Thread Adapter FN 5.7 1/2x28 TPI DA422 — 3 Questions & 2 Answers

Name Dead Air Armament Thread Adapter FN 5.7 1/2x28 TPI DA422
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Q
BossMan, guest, from TX, United States, asked on October 20, 2020

Do you have to have a threaded barrel on your 5.7 to use a dead air mask or is this adapter all you will need?

A
Answered by J, guest, from FL, United States, on September 17, 2021

You need to have a threaded barrel on your 5.7. The thread pitch on the 5.7 is 10X1mm RH, due to the diameter of the smaller round. This adapter converts the 10X1mm to the more common 1/2X28 thread pitch

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Q
phencer, guest, from GA, United States, asked on March 23, 2018

Does this fit FN PS90? Or is this meant for FN57 pistol only?

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on May 29, 2018

This will not fit the PS90 because for some reason FN uses a different thread pitch on the PS90 barrels. The PS90 has a M12x1.0 LH thread while the Five-Seven has a 10x1mm RH thread.

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Q
Dave Fizzano, member, from PA, United States, asked on March 04, 2020

How exactly does this work? Does it screw into the stock barrel somehow or does it require a threaded barrel?

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