The Brownells Iron Sight Glock 34 Slide is machined entirely from heat treated stainless steel and features a black-nitride finish to protect it from corrosion and wear. The Brownells Iron Sight cut slide features OEM style rear serrations and additional front serrations for enhanced manipulation. The Iron Sight cut slide also features a window cut on the top between the front serrations that reduces weight. Internally, the slide is machined to Glock factory specs, so it'll accept all standard G34 components Channel liner required for these slides. Channel liners are a press fit and require a tool to install. Mfg: Brownells