The Gun Store | Waterbury CT

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Juggernaut AR-15 CA Roster Handgun 5.56mm 10rd Magazine 8.5″ Barrel Black

June 12, 2026
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CZ USA P-10 C Ported Handgun 9mm Luger 15rd 4″ Barrel COA Black

June 12, 2026

Sig Sauer M400 Forge Black Rifle 5.56 NATO 10rd Magazine 16″ Barrel ROMEO-MSR GEN II Adjustable Stock M-LOK Handguard CA Compliant

$999.99

Sig Sauer M400 Forge Black Rifle 5.56 NATO 10rd Magazine 16″ Barrel ROMEO-MSR GEN II Adjustable Stock M-LOK Handguard CA Compliant

8 in stock

SKU: LIP|SIRM40055616FCA Category:

Features:

  • TriggerTech 3.5 pound two-stage flat blade duty trigger
  • 16" cold hammer forged barrel with mid-length gas system
  • ROMEO-MSR Gen II 2 MOA red dot included
  • Full-length free-floating M-LOK handguard
  • Ambidextrous charging handle
  • MAGPUL SL-K 6-Position adjustable stock

Specifications:

  • FIREARM TYPE: Rifle
  • CALIBER: 5.56 NATO
  • SIGHTS: ROMEO-MSR GEN II w/2 MOA DOT
  • BARREL LENGTH: 16 in [406.4 mm]
  • BARREL MATERIAL: Cold Hammer Forged Steel
  • TWIST RATE: 1:7
  • THREADS: 1/2 in – 28 90 Degree Shouldered
  • MUZZLE DEVICE: A2 Birdcage Flash Hider
  • ACTION TYPE: Semi-Auto
  • OPERATING SYSTEM: Mid-Length Direct Impingement
  • STOCK TYPE: 6-Position Magpul SL-K
  • GRIP TYPE: Reduced Angle
  • TRIGGER TYPE: TriggerTech 3.5-Pound 2-Stage Flat Blade
  • TRIGGER SHAPE: Flat
  • MANUAL SAFETY: Ambidextrous
  • FOREND TYPE: M-LOK Black Cerakote
  • ACCESSORY RAIL: M-LOK/Full-Length Picatinny
  • MAG TYPE: AR-15
  • MAGS INCLUDED: (1) 10rd Polymer Mag
  • COLOR: Concrete Gray
  • RECEIVER FINISH: Black Cerakote
  • OVERALL LENGTH: 35.5 in [901.7 mm]
  • COLLAPSED LENGTH: 32.25 in
  • OVERALL WIDTH: 2.7 in [68.58 mm]
  • HEIGHT: 9.4 in [819.15 mm]
  • WEIGHT: 6.8 lb [3084.43 kg]
UPC

798681744138

Manufacturer

Sig Sauer

Manufacturer Part Number

RM400-556N-16B-FORGE-CA

Action

Semi-Auto

Barrel Length

16"

Caliber/Gauge

.223 REM/5.56 NATO

Capacity

10

Model

M400 Forge

Product Type

AR

Rate of Twist

1:7"

Shipping Weight

9.718