GM-M15 20" M16 A1 5.56x45mm 1:12 twist

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Caliber- 5.56x45mm W/M16 Extension
Twist Rate- 1:12
Length- 20"
Profile- M16 A1 Pencil, Please find the detailed drawing of this barrel in the photos above
Finish- Chrome Line Phosphate
Gas System Length- Rifle Gas Block OD- .625+-(.001)
Steel Type- 41V50
Thread Pitch- 1/2x28
Weight- 1.70lbs

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