From the Keltec Facebook page (https://www.facebook.com/KelTecWeapons/).. Quoted from the facebook page" "It's a 20" with a different twist rate than production. I'm currently testing it. Been getting 1 MOA or better so far. Hopefully we can eventually offer this barrel." I wonder if thats all they did..If so..What do we do to get it..Send the current rifle we have in? Can it be shorter (I do like my 18"