How to install flash suppressor and crush washer?

It depends on the rifle. There is no one-size-fits-all answer since each rifle has its proprietary flash suppressor and barrel threading.

However, there are a few general tips that can help:

1. Consult your rifle’s owner’s manual to find out what type of flash suppressor or muzzle brake your rifle uses, and how to remove it.
2. If you’re not sure how to remove the old flash suppressor, consult a gunsmith or watch a video online.
3. Purchase a new crush washer for your specific rifle and size of flash suppressor/muzzle brake.
4. Follow the manufacturer’s instructions for installing the new crush washer and flash suppressor/muzzle brake.
5. Once the new flash suppressor/muzzle brake is installed, take your rifle to the range and test it out.