There is no spacer behind a flash hider. It is a crush washer and you never use a crush washer with a can.
The spacer is needed if you use a pistol suppressor on a rifle.
Pistol threads are .450 long, where rifle threads are .625 long. So you need a spacer about .18 long so the muzzle doesn't hit the first baffle and render the can almost useless.
Quote:
Originally Posted by CustomChevyGuy
I used the spacer that sat behind the flash hider. Here's a pic of the can backed off of the threads, showing the spacer, (cone end first) for reference. I hand tightened it and it seems to fit about right.
I roughly measured it out with a small dowel, and it seems to be enough of a space. I'm planning to measure it out with a caliper to make sure it's got clearance before I shoot it.
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