The Firearm Blog website reported that Swiss company B&T won an order to supply the U.S. Air Force with 65 APC9K 9×19 mm carbines with magazines and associated spare parts. The value of the contract is said to be $128,300. The contract is called "Prototype Opportunity Notice (PON) for Sub Compact Weapon (SCW) System" which may indicate that it is an initial order for evaluation, with a potential for more. It’s not known which configuration the APC9 will be in, but the website said that it could be the APC9K PRO version.
In April 2019, B&T won the Sub Compact Weapon contract in competition with five other companies, with an initial order for 350 APC9K semi-automatic carbines to the U.S. Army worth more than $2.5 million, with the option of up to 1,000 more.
The website said that it is likely, but not mentioned or confirmed, that the new B&T APC9Ks will end up with the security personnel of the U.S. Air Force and that they may replace Heckler & Koch MP5s. The Miami Beach Police Department is another user of the B&T APC9K.