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14.5" M-4 Profile Barrel
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14.5" M-4 Profile 1 X 9 twist barrel.  Pre-ban ARM-4 Govt Profile Barrel 1x9 Twist.  This is considered a short barrel for SBR's or pistols only.

M-4 4150 Chrome lined 1X7 twist
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16" M-4 4150, F Sight, M-4 Ramps, Chrome Lined Gov't Barrel.
16" M-4 4150, F Marked Front sight base, M-4 Ramps, Chrome Lined Gov't Barrel.