This Lilja Sako Quad 22LR bull barrel is .900" diameter straight. These barrels are true match-grade barrels and made from 1" diameter 416 alloy rifle-barrel-quality stainless steel. 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 replacement barrels do not require any special gunsmithing. Each barrel is cut to a true match chamber. Accuracy with the barrel 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 Precision Rifle Barrels Lilja Sako Quad 22LR Bull Barrel