by Max Barry

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by The Unitary Technocracy of Etoile Arcture. . 123 reads.

MP510 Submachine Gun

This page is a work in progress by its author and should not be considered final.

MP510 Submachine Gun


Submachine gun

Place of origin

Etoile Arcture

Service history

In service

2005 - present

Used by

Etoile Arcture Special Forces
Forces Spéciales
Astograthian Special Forces

Production history


Sequoia Weaponworks




Sequoia Weaponworks

Unit cost


Number built

A fair few I guess





2.2 kg empty,
3.47 kg loaded


675 mm w/ stock extended
442.5 mm w/ stock folded

Barrel length

210 mm


  • 9×19 mm Parabellum

  • .40 S&W (10×21 mm)

  • 10mm Auto (10×25 mm)

  • Action

    delayed blowback

    Rate of fire

    800-900 rounds/min cyclic

    Muzzle velocity

    ? m/s

    Effective firing range

    100 m

    Maximum firing range

    150 m

    Feed system

    30-round box mag
    (9 mm Para, .40 S&W),
    10- or 25-round box mag
    (10 mm Auto)


    rotary drum type rear,
    hooded post front

    The MP510 Submachine Gun, model MP510A3, is a gas-retarded, blowback operated, selective fired submachine gun firing from the open bolt position. It is in part based on the design concept of the G500 Modular Weapon System of which it shares a small degree of parts commonality and manual of arms, differing largely in the type of operating system and feed mechanism used. The MP510A3 boasts high accuracy and a close pattern of single shot and automatic fire. Through precisely machined and self-cleaning parts the system is highly reliable, and the non-moving barrel combined with a straight line recoil path and solid weight has the effect to significantly reduce felt recoil so increasing accuracy on the first shot and controllability thereafter. The weapon is fully able to fire all types of ammunition including supersonic and subsonic loads (with a silencer), high impulse +P cartridges and frangible training rounds.


    The upper and lower receiver of the MP510A3 partly resembles the G500 series, and in particular the G501KA3 carbine in shortened form. Both the upper and lower receiver are constructed from shock, temperature and corrosion resistant polyetherimide polymer moulds reinforced by aluminium alloy inserts and secured using tool steel cross-bolts. The eight inch barrel is cold hammer forged from a solid steel blank and features a hardened chrome-plated bore, chamber, bolt and gas system for maximum corrosion resistance and durability. The barrel has polygonal rifling with a twist ratio of 1 turn in 16 inches, and has a quick mount on the muzzle for attaching a snap-on aluminium sound/flash compensator (e.g. Knight's Armament QDSS-NT4).
    The upper receiver contains the operating system, a right/left swappable ejection port with spring-loaded dust covers, T-handle cocking lever and side-folding skeletonized polymer buttstock using a positive locking action. The lower receiver includes the magazine well (flared to assist quick magazine changes) and magazine catch, bolt catch, pistol grip and moulded trigger guard with ambidextrous safety/selector levers. Polylithic accessory rails are moulded directly on the receiver, with Vltor KeyMod side rails/ventilation holes and a full-length MIL-STD-1913 Picatinny top rail and three half-length fore-end rail for attaching a variety tactical accessories including sights, tactical lights, underslung grenade launcher or laser dazzler, and vertical grips. Fixed sights consist of a LinkHK-style rotary diopter rear sight and front hooded post with Tritium luminous dots for night shooting.
    Internally the MP510A3 consists of a barrel and a gas cylinder fixed to the frame, a hammer-type internal firing mechanism based on the G500 series, but departing from a gas operated rotating bolt system by having a gas-actuated delayed blowback operating system with a telescoped bolt that wraps around the barrel in the forward position. This functions by venting a portion of the propellant gases generated during firing from the barrel back into the breech via a ported gas cylinder above the barrel that delays the rearward movement of the bolt, which is never locked. The weapon operates in simple blowback mode until the point the cartridge crosses the opening of the gas cylinder, at which point a self-centering piston closes off the port. The mechanical simplicty of the design allows the weapon to fire all types of ammunition including subsonic and supersonic loads and high loading +P cartridges with low felt recoil.
    Operating controls are identical to those found on any G500 series rifle allowing for easy familiarisation for training conversion. These feature a three-round burst trigger group and a firing pin block to prevent accidental discharge if dropped. The charging handle is a AR15-style T-shaped handle providing ambidextrous operation. The weapon utilises a double column straight polymer magazine compatible with the Heckler & Koch UMP submachine gun, and features a translucent witness window that provides visual indication of ammunition remaining. On emptying a magazine a bolt hold-open (BHO) device holds the bolt and firing pin back for added safety, and engages with the follower of a magazine allowing smoother reloads.



      Special Forces (SF) model chambered in .40 S&W with aftermarket accessories including a Knight's Armament QDSS NT-4 compensator, Meprolight Mepro 21 reflex sight and Istec ISL 202 underslung 40 mm grenade launcher.


      Law Enforcement (LE) model chambered in 10 mm Auto with aftermarket accessories including Meprolight Mepro 21 reflex sight and Thales Green Light Optical Warner (GLOW) laser dazzler on bottom rail.


    Etoile Arcture

    • Etoile Arcture Special Forces

    • Etoile Arcture Gendarmerie Force

    • Police Service of Etoile Arcture


    • Forces Spéciales

    • Corps des Marine

    • Service Gendarmerie

    • Sécurité intérieure


    • Astograthian Army

    • Astograthian Special Forces

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    • Cartridge: 9×19 mm Parabellum, .40 S&W (10×21 mm) or 10mm Auto (10×25 mm)

    • Action: gas-actuated delayed blowback

    • Locking: telescoped bolt

    • Weight: 2.2 kg empty, 3.47 kg loaded

    • Overall length: 675 mm w/ stock extended, 442.5 mm w/ stock folded

    • Barrel length: 220 mm

    • Muzzle device: ?

    • Feed type: 30-round polymer box magazines (9 mm Para, .40 S&W), 10- or 25-round polymer box magazines (10 mm Auto)

    • Sights: rotary drum type rear, hooded post front + aftermarket reflex sight, red dot sight or day/night optics

    • Muzzle velocity: ? m/s

    • Effective range:

      • 100 m vs point target

      • 150 m vs area target

    • Fire control: drop-in replaceable trigger group, ambidextrous selector levers

    • Rate of fire: 45-100 rpm practical, 650-700 rpm cyclic

    • Trigger pull: single-stage Match non-adjustable, 29.35 N pull

    • Unit replacement cost: US$500