Quoted: so is the main reason for these washers, so your FS doesn't unscrew?
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No, these are not lock washers, which prevent your FS from coming loose.
Peel and crush washers are for indexing, or aligning, your muzzle device in the correct direction. This is only a concern for FS, muzzle brakes or compensators that are asymmetrical and have ports that must face a certain direction, usually up. Of course you can use these washers with non-indexed FSs as well.
i thought the amount of torque you applyed to the FS was a standard amount and thats why you need a torque wrench... true?
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The required torque is a range. Once you've reached the minimum torque, just tighten until the FS is correctly indexed. But I don't usually bother with the torque wrench. Just tighten until it feels secure.