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Quick Hold-Over Refs (SS197SR)
50 YD+0.8"
100 YD (Zero)0.0"
150 YD-2.8"
200 YD-8.5"
ELEVATION (IN)
-3.3
WINDAGE (IN)
1.6
RANGE (YDS)150
WIND (MPH)5
ALTITUDE (FT)0
TEMP (°F)59
YDDROPVELWIND
Dark Mountain Arms: Stowaway
Caliber5.7 x 28mm
ActionBolt-Action (Single Shot)
Receiver7075-T6 Billet (Angstadt Arms)
Barrel16" 4150 Chromoly 1/2-28
Length (Firing)31.78 Inches
Length (Stowed)16.65 Inches
WeightUnder 3 lbs (Stripped)
Leapers UTG: SCP3-UM312AOIEW
Mag / Obj3X - 12X / 44mm
Tube30mm (TS Platform)
ParallaxSide Wheel (10yd-Inf)
ReticleMil-Dot (36-Color IE)
Click Value1/4 MOA @ 100 yds

TACTICAL CHECKLISTS

  • Firing Sequence: Level bubble. Adjust Side AO turret until target is sharp (removes Parallax). Breathe out; fire at pause.
  • Takedown Packing: Clear chamber. Unscrew barrel nut. Place barrel in Carhartt laptop sleeve.
  • Maintenance: Bore snake breech-to-muzzle. Clean bolt face carbon with nylon brush.
Smith & Wesson: M&P12 Bullpup

SKU: 12490

CHAMBER: 12 Gauge, 3” Magnum

CAPACITY: 6+6 (3") or 7+7 (2-3/4") Dual Tubes

BARREL: 19.0” 4140 Chrome-Moly

OAL / WEIGHT: 27.8” / 132.8 oz

SIGHTS: Magpul MBUS 3 (Flip-Up)

Choke Inventory
BuckshotCarlson's Ported .700

MATERIAL: 17-4 PH Stainless Steel

LIMIT: No Steel > 1550 FPS

TurkeyBriley Helix Hunter

BULLPUP CHECKLISTS

  • Operation: MBUS 3 Large Aperture for Buckshot. Forceful pump rack to ensure feed from dual tubes.
  • Maintenance: Scrub ports on Carlson's/Briley chokes. Grease threads to prevent heat seizure.
TARGET DISTANCE (YDS)15
EST. SPREAD (IN)
15.0
AeroShell 33MS / 64 (Moly Grease)

STOWAWAY THREADS: Apply thin coat to barrel/receiver threads to prevent galling.

M&P12 CHOKE: Apply to Briley Helix threads; prevents heat-induced seizure.

BOLT LUGS: Small amount on rear of Stowaway locking lugs.

PROPERTIES: High-pressure paste; creates physical moly barrier.

Hoppe’s No. 9 Lubricating Oil

M&P12 ACTION: Apply to dual action bars and carrier for smooth cycling.

STOWAWAY EXTERIOR: Wipe down all-metal surfaces to prevent rust.

PIVOT POINTS: Trigger pins, safety selector, and hinges.

PROPERTIES: Low-viscosity; wicks into tight spaces; requires frequent re-application.

LUBRICATION PROTOCOL

  • Zero Mixing: Do not mix grease and oil; oil breaks down the grease base.
  • Surface Prep: Clean with solvent before selecting one specific lubricant.
  • Environmental: Use oil for general moisture barrier; use grease for high-heat threads.
RCW 9.41.390 (WA ASSAULT WEAPON BAN)

STOWAWAY 5.7: Manually operated bolt-actions are exempt.

M&P12: Pump-action shotguns with fixed magazines are exempt.