Place of origin
2015 - present
Heaps and many
12 Gauge magnum
Rate of fire
Effective firing range
Maximum firing range
The MAG12 MK 4 Assault Shotgun, also know as the "Punisher", is a lightweight, air cooled, long-stroke gas piston operated, magazine fed, smoothbore, internally choked, selective fire semi-automatic (i.e. self-loading) shotgun chambered for 12 gauge ammunition. It shares the same ergonomics, controls and manual of arms with ambidextrous safety and mag release as the G500 Modular Weapon System (G500 MWS) for easy familiarity and training conversion. The MAG12 is configured inline with a long-stroke straight line recoil path and high effect muzzle brake that reduce muzzle climb, peak recoil and cyclic rate of fire for high controllability in semi-auto fire. A self-adjusting gas system vents excess gas for recoil mitigation/attenuation and alleviation of stress on the operating components for increased reliability.
The MK 4 "Punisher" is designed to fire high-impulse, multiple projectiles with an effective range of 40-150 metres during close quarters battle, door breaching, riot control and bunker defence. Recommended ammunition loads include standard or shaped-pattern shot rounds fired from choked barrels, fin-stabilized flechettes, solid and sabot slugs, and specialized FRAG-12 and flare rounds available in various colours. The self-adjusting gas system can also cycle low power ammunition, including beanbag, stingball, rubber batons/slugs, Hatton door breaching and Ferret barricade penetrating chemical rounds. The barrel has an internal choke system with replaceable screw-in choke tubes for greater accuracy and tighter shot patterns, and muzzle threads for tactical stand-off devices.
The MAG12 has an aluminium reinforced GF/PA-6 glass fibre/polyamide-6 upper receiver and handguard, and single moulded polyamide lower receiver, magazine well and pistol grip partially resembling the G500 MWS. Controls consist of an ambidextrous safety lever, magazine release and bolt carrier group release on the lower reciever, and a non-reciprocating forward charging handle with oversized tactical bolt handle on the left side of the upper receiver. A larger ejection opening and cut-out on the right side of the receiver is protected by a spring-loaded cover to prevent penetration of dust and foreign particles into the receiver that can foul the action. The fore-end is ventilated and features moulded-in four-quadrant polylithic accessory rails combining a Vltor KeyMod Universal Mounting System in the 3 and 9 O'clock positions and MIL-STD-1913 Picatinny rails in the 6 and 12 O'clock positions. A carry handle with open sights or any aftermarket iron sights or optics can be installed on the top rail, which has a 20 MOA elevation cant. The buttstock is an aluminium LR300-style side-folding telescoping skeletonized design with a five-position collapsible mechanism and non-slip polymer buttpad.
The gas system is constructed from 4140 chromium molybdenum alloy steel (aka ordnance steel), consisting of the bolt group, chamber, barrel bore, piston and gas cylinder, that are chrome lined for gas erosion and corrosion resistance and finished with a matt black manganese phosphate coating for durability. The barrel has a cylinder bore (no-choke, full-open bore) and accepts interchangeable screw-in internal choke tubes e.g. cylinder bore (5 notches) as standard for using frangible compressed zinc breaching slugs in dynamic entries to remove door hinges and door locks; improved cylinder bore (4 notches) that increases hit probability with rifled slugs and produces tighter patterns with a wide range of loads (shot, bean bag, etc); modified (3 notches) for tight shot pattern density; and full (1 notch) for long range shooting with sabot slugs. External threads on the barrel over the choke area accept stand-off muzzle devices such as a door breach/glass breaker device.
The fast cycling self-adjustable gas system is patterned on a conventional closed-bolt operating system with a gas chamber and piston, comprising a long-stroke gas piston located above the barrel and a rotary bolt locking mechanism in the upper receiver. The weapon is cycled by gas diverted by gas ports in the barrel bore to a gas cylinder that impinges upon a annular gas piston to drive the bolt carrier rearwardly along dual guide rods machined into the receiver. The self regulating gas system automatically adjusts to the recoil of the weapon (aka infinite adjustments) allowing cycling of all types of 12 gauge shotshells, loads and powder charges.
The breach is locked and unlocked by a substantial "monolithic" 12 gauge bolt carrier with a heavier reciprocating mass, featuring a rotating bolt with two massive locking lugs in the bolt head that engage with corresponding recesses in the barrel extension. A cam pin rides an S-shaped cam track on the bolt to control the locking and unlocking of the chamber. A spring extractor is located on the bolt head, and as the bolt travels back it engages with the rim of a shotshell to extract and eject a spent case until reaching a stop, leaving the weapon cocked and ready to fire, before the long-stroke recoil spring, comprising a telescoping piston rod that compresses "Belleville" conical spring washers, forces the bolt forward again where it will strip a fresh round from the magazine to load in the chamber. A bolt hold-open device locks the bolt to the rear when the mag is empty or whenever the bolt is manually pulled back without a magazine loaded, allowing faster reloads and clearing of the chamber of misfired or dud rounds.
The magazine well is slanted at 45° compared to the straight geometry of the G500 magwell allowing it to accommodate AK-pattern curved magaines, with the push-button release mechanism of the G500 being replaced by a spring-loaded plunger to ensure smooth and fast mag changes. The weapon can accept all types of 12 gauage ammunition and functions with both 70 mm (2¾") and 76 mm (3") length rimmed shotshells. Sequoia Weaponworks provide a 10 round single stack curved polymer magazine modelled on an extended length 7.62 mm AK-pattern detachable box magazine, with an optimised feed geometry that reliably feeds ammunition of both lengths loaded into the same magazine. Constructed from Zytel impact-resistant thermoplastic polyamide reinforced by steel mesh at the feed lips, the magazine also features a robust polymer four-way self-leveling/anti-tilt follower and strengthened heat-treated chrome silicon wire spring for reliable operation. The weapon can also use magazines compatible with OEM (original equipment manufacturer) AK-pattern mags made for the SAIGA-12/VEPR-12 shotguns and a select few aftermarket mags including the MD Arms MD-20 20-round drum magazine and Izmash 10-round box mag.
- Standard version chambered in 12 Gauge rimmed shotshells.
Etoile Arcture Special Forces
Cartridge: 18.5×70 mm (12 gauge × 2¾") or 18.5×76 mm (12 gauge × 3") rimmed shotshells
Action: gas operated, piston driven, long stroke
Locking: rotary bolt w/ 2 lugs
Weight: 3.5 kg empty, 5.3 kg loaded (20 rds)
Overall length: 960 mm w/ stock extended, 886 mm w/ stock folded
Barrel length: 451 mm (17¾ in)
Muzzle device: door breach/glass breaker
Feed type: 10 round single stack 3" shotshell detachable box magazine or 20 round 2¾" shotshell detachable drum magazine
flechette (19 × MIL-F-8167 8 gr flechettes)
Foster-type rifled slug
FRAG-12 (HE, HE-FA, HE-AP)
Hatton door breaching round (compressed zinc)
Ferret barricade penetrating round (non-pyrotechnic irritant agent liquid or powder CN, CS, OC and inert fillers)
stingball (.32 cal rubber balls)
Rocket rubber baton round (fin stabilised 80 durometer rubber projectile)
hydro-kinetic impact bag
Sights: aftermarket iron sights, day optics, etc
Muzzle velocity: ? m/s
25 m w/ #OO buck
50 m w/ stingball (improved cylinder choked)
35 m w/ bean bag (improved cylinder choked)
25 m w/ Hatton round (improved cylinder choked)
40 m w/ Rocket rubber baton round
45 m w/ flechette
75 m w/ rubber slug
100 m w/ Foster-type rifled slug (improved cylinder choked)
200 m w/ FRAG-12
Fire control: drop-in replaceable trigger group, ambidextrous selector levers
Rate of fire: 60-75 rpm practical, 240 rpm cyclic
Trigger pull: single-stage Match, non-adjustable 17.7 N pull
Unit replacement cost: US$2,500
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