It seems like everyone is making a .22lr version of their firearms theres days. From the S&W M&P 15-22, STG-44 and even the MP-40 Schmeisser is getting a .22lr redo. It looks like KRISS is entering the .22lr market with a rimfire version called the Vector .22LR. Just like .223, the cost of .45ACP has been on the rise making training with firearms like the Vector quite costly. The new Vector .22LR will have the exact same design externally as well as the same fire controls. No word on pricing as of yet, but a Carbine and Special Duty Pistol (SDP) are expected to be released late 2013.
Good luck finding .22 lr
How about a .22 version of the Britiah SA80