Lilja barrels are a true match-grade barrel. When creating barrels, there is only one grade they allow, the best. Made from 1" diameter stainless steel, every barrel is created through Lilja's state-of-the-art facility. Lilja Drop In replacement barrels do not require any special gunsmithing. Each barrel is cut to a true match chamber. Accuracy with the Bull barrel and Sundberg taper is excellent. Groups at 50 yards for 5-shots can be expected to be in the .2"s with target ammo. Lilja is synonymous with quality in the barrel replacement industry. Lilja Drop In Replacement Sundberg Taper for Sako Quad - 17HMR - 23"