GI Muzzlecaps, as shipped w/ Colt's factory rifles. These are "shoot through", and are the longer narrower type, they offer a tight seal at the muzzle.
Prevent rain from getting down your bore. Prevents mud/debris buildup at the flash suppressor, and keeps mud/gunk from your crown. Great for rain and crossings.
Buy a bunch and keep them handy in the tool box/parts bin.
$1.00 ea. plus actual shipping....
Orders of 10/+ shipped free
, OK, w/ NO FEE