MODEL 15 | PERSONAL DEFENCE WEAPON
Type: Automatic Only, Magazine-fed, Personal Defense Weapon
Operation: Select-Fire, Delayed Blowback
Action: Roller Delayed Blowback
Caliber: 9x19mm Parabellum
Capacity: 20 or 30 round polymer box magazine
Fire Modes: Safe, Fire
Rate of Fire: 850 rpm (cyclic)
Muzzle Velocity: Variable, depending on caliber
Effective Range: < 50 meters
Maximum Range: ~100 meters
Safety: Drop Safety, automatic Firing Pin Safety, Manual safety
Trigger Pull: 5.3 lbs
Barrel: SNC-treated, Cold Hammer-forged
Rifling: Variable, depending on caliber
Furniture: Impact-modified, long fiber reinforced thermoplastic
OAL: 310 mm
Barrel: 130 mm
Width: 48 mm
Height: 176 mm
RIS Length: 180mm
Weight: 1.53 kg (unloaded) ~1.83 kg (20 rounds loaded)
The Model 15 was designed as a compact Personal Defense Weapon or PDW for security teams and law enforcement that require a low profile weapon without sacrificing firepower or reliability. Initially adopted by the Marsa Diplomatic Security Corps, the Department of the Amastoli government that oversees security and protection for all diplomatic missions and embassies in Marsa, the nations capital. Its small size compliments the larger Model 10 Sub Machine Gun in that it offers a reliable weapon for those who cannot afford to carry the larger weapon, or cannot openly carry a full-size Sub Machine Gun for security or public relations reasons. As such it has found a large market in the personal protection market for both political and other public figures where the presence of larger weapons would seem 'excessive.' Only slightly larger than some military issue pistols, the Model 15 straddles the line between sub machine gun and machine pistol. Its narrow compact form allows it to be easily concealed under a short jacket or be fit into the escape and evasion kit of a pilots ejection seat, providing compact firepower wherever it may be needed. The Model 15 is used in New Hayesalian service as a secondary weapon for specialist troops, special forces and pilots.
The Model 15 is a roller-delayed blowback fully-automatic sub machine gun that uses a single unitary roller as a locking mechanism and a light-weight bolt. This method keeps the weight of the moving pieces down and thus felt recoil, while at the same time reducing the number of components that could fail under combat conditions. The firing pin contains a single vertical flange that helps keep it aligned within the bolt during travel. The flange is tapered so that as the bolt comes to a stop with a round in the chamber, the firing pin continues forward to strike the rounds primer, the taper of the flange forces the roller upwards into a recess at the top of the bolt extension. This action locks the bolt to the barrel extension preventing the bolt from recoiling immediately after firing, the delay allowing the pressure in the chamber to drop to a safe level before unlocking. Upon firing recoil forces the roller out of the recess, the taper of the firing pin flange being forced back by the downward force of the roller, allowing the bolt to recoil rearwards, its inertia overcoming the tension of the recoil spring allowing it to extract and eject the spent cartridge. A fixed stud on the receiver wall engages the over sized crescent shaped plunger of the ejector, ejecting the spent cartridge powerfully out of the weapon. The strong ejection force combined with an oversized extractor and a much smoother extraction force than traditional blowback action; decreases the chance of a ripped cartridge rim or a stuck case; some of the primary causes of jams. A non-reciprocating oversized charging handle is located at the rear of the frame, the charging handle is grasped and cocked much like pulling back on the slide of a pistol making it intuitive for most users military or law enforcement personnel. The trigger and safety/fire selector are made of thermoplastic over molded steel that helps reinforce these commonly used controls. The fire selector is ambidextrous and is slightly recessed into the body, making it easily accessed by the thumb of the firing hand, but without sticking out to far from the body. This helps keep its slim profile without sacrificing ergonomic or operational capacity.
The body of the Model 15 is constructed of the same Impact-modified, long fiber reinforced thermoplastic, A high temperature, high strength polymer that though it does not take the firing stress of the action directly reduces the weight of the weapon by replacing the heavy stamped steel exterior used on most contemporary sub machine guns. The polymers increased Specific Tensile Strength (KSI) over Steel (ASTM A131) and Aluminum (6061-T4), and reduced wear due to vibratory stress increases the service life of the weapon without sacrificing reliability in the field. Grip surfaces are pebble-textured to provide an excellent grip and strength regardless of how wet or slippery an environment the operator is stationed in without being overly abrasive. A seven inch section of M1913 specification rail is milled into the overmolded polymer body of the Model 15 near at the rear of the weapon (forward of the cocking handle) and is designed for mounting optical or electro-optical accessories. With the rapid advancement and reliability of modern day optical or holoscopic sights, and the weapons relatively short sight radius, Optical sights where chosen as the intended primary sighting system for the Model 15. Low profile front and rear iron sights feature tritium illuminated dots, with contrasting green/amber lamps installed in both the rear aperture sight and front post for fast low light acquisition. The front sight rest in a depression at the front of the M1913 rail, while the rear sight is built into the rear of the rail. Technically considered an improved 'guttersnipe' system its accuracy is relatively poor beyond close range encounters, but as iron sights were intended only for use in the event of an emergency they serve admirably in that role. For those seeking the ultimate in low profile who want some more substantial iron-sights, the Model 38 Stonewall Back up Iron Sights (BUIS) can be attached, and brought into action with the push of a button. The allows for a very low profile arrangement while stored that can then be sprung into action at a moments notice.
A modular barrel weight system can be installed into the bottom of the fore-grip in two hundred gram increments in order to cut down on the weapons muzzle climb by shifting the weapons weight forward. In place of a barrel weight the hollow fore-grip is secured with an o-ring sealed screw cap allowing the space to be used to store a replacement firing pin or replacement batteries for attached accessories. An ambidextrous magazine release is located on the right sight of the weapons trigger guard, and can either be released by grasping the magazine housing in the traditional method or released with the index finger of the firing hand by pressing downwards. Tactical reloads are exceptionally easy, and combined with a flared magazine well allow for lightning quick reloads even under stress or from multiple angles. Wide rounded sections (such as the fore grip and pistol grip) have been flattened off to ensure a narrow uniform profile, that combined with the rounding of most sharp corners makes the weapon as snag-proof as possible considering necessary functionality. Field stripping is essentially as simple as possible in an automatic weapon, Removing the rear locking pin the upper receiver is tilted forward exposing the working components The Bolt and Recoil tube.
The Model 15 is fed from a ten, twenty, or thirty round advanced polymer magazine design, the twenty round magazine being designed to not extend much beyond the pistol grip in order to maintain as small a profile as possible. In order to provide the best compromise of corrosion resistance fatigue resistance and strength, the magazine uses a heat-treated triple braided stainless steel spring. Because of its small size and its intended role the Model 15 may be fired around corners or over the top of cover as needed, this however requires a strong ejection system and a suitably strong magazine spring to ensure reliable feeding and ejection regardless of the current angle of the weapon. A compression stop on the bottom of the self leveling follower prevents the spring from exceeding its elastic limit and allows for long term storage of rounds in magazine without the worry of loss of reliability. The self leveling follower of the magazine is constructed of high density polymer that’s Teflon coated for dry lubrication and is dyed one of several bright colors, neon orange being the most popular due to its visibility in the side window.
A heavy cold-hammer forged barrel is standard on the Model 15, not only to resist the heat of sustained firing, but also to survive the extreme conditions it may be put through such as firing with water in the barrel. The bolt is Investment cast and milled to form the final bolt shape before being Salt Bathed Nitrocarburized (SNC) treated to protect and dry lubricate the working components. The bolt is coupled to a two-section Vollmer-style encased telescoping recoil tube which can quickly be replaced or removed for cleaning without the risk of losing or damaging the spring components. The bolt and captive recoil-tube are kept together in the upper receiver by spring tension provided by the recoil tube, pulling back on the front half of the recoil spring removes the firing pin from the rear of the bolt and unlocks it from the barrel extension. Once the spring pressure is off the bolt and the recoil spring both modular units can be removed from the upper receiver easily. The trigger unit and feed guide is located in the lower receiver and can simply pulled straight up and out as a single modular unit, making replacement and regular cleaning easy. The feed guide is comprised of a reinforced magazine guide and a set of machined steel feed lips reinforce the magazines existing feed lips in order that help firmly guide cartridges from the magazine into the chamber. This prevents double feeding or balloting of rounds ensuring smoother and more controlled loading along the feed ramp improving feed reliability and magazine service life. Because of the simplicity of field stripping, it is very unlikely for the operator to loose a crucial component if forced to field strip the weapon in the heat of battle, even so its dry lubricated components, ample operating space and controlled feed/extract operation means that the majority of jams an operator can encounter in battle have been drastically reduced.
Compact, reliable, and flexible to the tactical needs of the user, the Model 15 is capable of serving with distinction and discretion where ever it may be needed.