Professional upgrade drop in barrels for Gen 3 & 4 Glock 17 & 19 Pistols. The Match Grade barrels are precision machined from Certified pre hardened DFARS compliant 416R chromium gun barrel quality stainless steel, to extremely tight tolerances and exacting details.Features :9INE Barrels are a drop in fit and do not require gunsmithing for assembly,Final dimension are held to a +/- 0.0002" deviation for maximum consistency"416R stainless steelBarrels are fluted and feature LANTACs proprietary Patent Pending flute pattern