Sig Sauer

SIG Sauer SIGM400 PRO 16” 5.56 NATO AR-15 Rifle - QUALIFIED INDIVIDUALS ONLY

SIG Sauer SIGM400 Pro 16” 5.56 NATO AR-15 Rifle - QUALIFIED INDIVIDUALS ONLY - Complete Rifle - view 1
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Sig Sauer

Overview

The SIG Sauer SIGM400 PRO 16” 5.56 NATO AR-15 Rifle - QUALIFIED INDIVIDUALS ONLY is a complete rifle. Compare prices from multiple merchants and find the best deal.

Specifications

MPNWRM400-556N-16B-PRO
PlatformAR-15
Caliber5.56 NATO
Gas System LengthMid-Length
Thread Pitch1/2x28
Action TypeSemi-Auto
Twist Rate1:7
ColorBlack
ComplianceStandard
Barrel Length16.0

Available Merchants(1)

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$1,136
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Build history on GunPartPicker

Builders on GunPartPicker first added the SIG Sauer SIGM400 PRO 16” 5.56 NATO AR-15 Rifle - QUALIFIED INDIVIDUALS ONLY to a build in May 2026.

It was out of stock everywhere we track for all of September 2026, and today the one retailer we track is out of stock. Listed prices start at $1,135.99 at KY Gun Company for when it comes back.

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