After watch some reviews between the fn's 5.7x28 and the 22tcm the tcm kicks but in a handgun over fn's little cartidge in a carbine and offers real 2100fps+ in a pistols 5" barrel . Even compaired to the 9mm fmj and 45acp on balisitc glass it out preforms the other two. Interesting round not to be over looked
http://www.youtube.com/watch?v=B56ymiv3-YQ
http://www.youtube.com/watch?v=B56ymiv3-YQ