NFA Manufacturers:
www.thompsonmachine.net
www.gem-tech.com
www.libertycans.net
www.huntertownarms.com
www.yhm.net
www.qsmsilencers.com
www.serbu.com
www.safetyharborfirearms.com
Forums:
www.nfatalk.com
www.silencertalk.com
www.ingunowners.com
www.snipercompany.com
www.indianashooter.com
www.weaponsguild.com
www.machinegunboards.com
www.sturmgewehr.com
Just waht you need for your factory threaded CZ 452 American to be able to run a 1/2x28 RH threaded suppressor of flash hider.
Price includes shipping to the CONUS.