Don't be confused by the 'New Style' vs 'Old Style'. Function-wise, they are identical - and they will all fit the exact same suppressors. The difference is in the new 'Smoother' styling.
This flash hider is used for any of the YHM Suppressors assuming that the host weapon is chambered for a .22 caliber (ie .223 or 5.56). It will also work inside of the LT/LTA/ULT .30 caliber suppressors. Available in a wide array of thread sizes.
Function
Style