It was primarily focused on suppressing 9mm (specifically sub-machine guns and SBRs). The R9 is capable of being used on a handgun in conjuction with our Nielsen Booster Assembly. It features 1 3/8″-24 rear mounting threads and ships in the 1/2″-28 Direct Thread format.
https://nagelsguns.net/product/yankee-hill-r9-9mm-silencer-direct-thread-mount-5-20-yhm-2155-28/

