Check your overall length. I put the barrel on my "firearm" and the total length was less than 26". Turns out my prior barrel, that I thought was 14", was really 15" and the total length with the bird's head grip was over 26". I put on the 14.5" and for some reason decided to check. I'm glad I did since it was under 26" with the 14.5" surplus barrel. I ordered a second barrel a couple of days ago, before I got mine first one today. Still glad I ordered two, but the first will go on an SBS.