Second of Ten · Inspection Viewer

SOTM4 13.9″ Monobloc® (Chrome-Lined)

5.56 NATO · 11.7″ M-LOK handguard · MOD-0 forged upper

×1.0

Specification

Barrel length
13.9″
Caliber
5.56×45mm NATO.223 Remington compatible
Barrel
HM Defense Monobloc®4150 chrome-moly steel
Bore
Chrome-lined, limited numbers
Barrel finish
Black Phosphate
Twist
1:8
Gas system
Mid-lengthGas block milled into the barrel blank
Upper receiver
SOTM4 MOD-0 forged, 7075-T6Barrel thermal fitted, no compound or bedding
Receiver finish
Type III hard-coat anodized, blackDry film lubricated
Handguard
11.7″ SOT Wedge-Lock M-LOKFree-float, 6061-T6, steel HD barrel nut
Bolt carrier group
SOT Enhanced HMB™, Black Nitride9310 bolt and carrier · 4340 cam pin · approx. 12.72 oz
Enhanced marks
Arrow-indexed cam pinIndex-marked gas key
Charging handle
Breek Arms WARHAMMER Mod2Ambidextrous, black
Muzzle device
A2 Extended Flash Hider, Black Cerakote®Standard
Fits
Any Mil-Spec AR-15 lowerCarbine, VLTOR A5 and rifle buffers