https://midstatefirearms.com/product/16-ss-5-56-nato-17-5r-mid-length-lightweight-pencil-barrel/

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This is a lightweight ‘pencil’ profile ar15 barrel made from 416r Stainless steel. It has a mid length gas system. This ultralight barrel will save a few ounces on your Ar15 rifle build. specs:

• 16″ Length
• 223 Wylde Chamber (shoots both 5.56 nato and .223 rem)
• 1:8 Twist
• 416r Stainless Steel
• .750 Gas Block Diameter
• 1/2-28 Threads
• Mid-length gas system
• m4 feed ramps
• Weight: approximately 1.5 lbs
• As usual, made in USA.