THIS MANUFACTURER HAS A LONG LEAD TIME
M4 type barrel extension
MIL-Speck AR-15 Barrel extensions in guaranteed to fit your MIL-SPEC AR-15 while offering optimal performance. Each AR-15 barrel extension features a stainless finish and is heat treated to protect against rust and corrosion and is precision machined to exacting standards with integral feed ramps and a pre-drilled locator pin hole.