How to install a ar10 comp?

[Darklyte27]

So Im building my ar pistol, i have a comp im trying to install but the wrench area is .801 inches, that would be 4/5ths or 20mm.

Do they make a ar10 wrench? I bought some wrenches at Lowes, 19mm and 7/8ths dont fit. the closest one that worked is 13/16ths.

The crush washer bowl up wouldnt let the wrench fit, bowl down with some shims work.

[ar15barrels]

You need a thin tappet wrench to fit on the flats with the crush washer facing the muzzle device which is the proper orientation.
You can also just take a regular wrench and grind it thinner.
13/16" is the one you want.