No. A firearm that was originally a rifle would be classified as a “weapon made from a rifle” if ; it has either a barrel less than 16 inches in length or an overall length of less than 26 inches. If an individual wishes to make an NFA firearm, s/he must first submit ATF Form 1, Application to Make and Register a Firearm, pay a $200.00 making tax, and receive approval of the application from ATF before converting the firearm.
[18 U.S.C. § 921(a)(3); 26 U.S.C. §§ 5845(a)(3)-(4)]