Bore size fro 5.7

Yes, it can be legal to make a silencer. For everything Form-1, from silencer designs that are easily made, to filing forms with the BATF, to 3D modeling. Remember, you must have an approved BATF Form-1 to make a silencer. All NFA laws apply.

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Frenchy
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Joined: Fri Oct 19, 2018 10:50 am

Bore size fro 5.7

Post by Frenchy »

Hello, Can anyone tell me the correct bore size or drill size to build 5.7x28mm suppressor?
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fishman
Silent But Deadly
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Joined: Sun Dec 20, 2015 7:15 pm

Re: Bore size fro 5.7

Post by fishman »

Between .26" and .30"
300 blackout form 1: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=137293

5.56 form 1:
http://www.silencertalk.com/forum/viewtopic.php?f=10&t=141800&p=955647#p955647
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ECCO Machine
Silent But Deadly
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Joined: Tue Nov 28, 2017 5:34 pm

Re: Bore size fro 5.7

Post by ECCO Machine »

fishman wrote:Between .26" and .30"
This. Your minimum aperture size is largely dependent on your precision, but any tighter than .040" over bullet diameter often has negative impact on accuracy.

I typically run .050" over bullet diameter; my .22/5.56 stuff gets a .27" hole (drill size "I"). I've tried running 1/4", and you could actually hear how the bullets were destabilized by that close clearance.
FFL07/02SOT Gunsmith & Machinist
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