Umbrella Armory



Build details
UA_HKMP5A4 build details



Air nozzle Maxx Model 19.5 millimeter double o-ring air nozzle
Anti-reversal latch Lonex anti-reversal latch, spring
Barrel Lapped 229 millimeter 6.03 stainless steel inner barrel with R-Hop patch
Bearing Umbrella Armory 8 millimeter steel caged bearing set
Bucking Madbull blue soft 60 degree bucking, flat hop modified
Cylinder Steel 3/4 ported cylinder
Cylinder head CNC double o-ring cylinder head
Electrical GATE Titan advanced V2 (rear-wired), pre-programmed
Gears 20:1 Siegetek DSG set
Gearbox shell Retro Arms V2 gearbox shell
Hop-up VFC MP5 AEG hop-up chamber, UA 3D printed flat arm
Motor Warhead Industries standard brushless motor
Piston Rocket polycarbonate,15 tooth steel rack, short stroked
Piston head Lonex polyoxymethylene piston head, washer AOE
Spring Guarder SP150 spring
Selector plate VFC MP5 AEG selector plate
Tappet plate Guarder tappet plate
Tappet spring G&G tappet spring
Trigger MP5 type trigger



Battery Matrix 11.1 volt 1450 mah 20c lithium polymer battery, stick type
Magazine Umarex MP5 AEG type 95 round mid-cap magazine 
Misc GATE USB link, patch, sticker

Choose a Color
Upgraded VFC & Elite Force HKMP5A4 AEG, equipped with individually tested parts and modifications suited for high performance competitive use

 This SMG is equipped with a unique CQBR/MILSIM mission package to last under heavy extended field use with increased efficiency and durability in mind while operating in close quarter Airsoft engagements.
330_FPS (.2g) 33_RPS (12.6v) 22_MS (12.6v) 215_FT (.32g)


  • Total length: 27 inch
  • Unloaded weight: 4.7 pound
  • Barrel length: 8.8 inch
  • Thread: -14 millimeter 
  • Brushless motor
  • Battery: stick type, Deans, 3-cell
  • Licensed Heckler & Koch
  • 3-lug muzzle prong
  • Lapped R-hop inner barrel
  • Programmable ETU / MOSFET
  • 1 year extendable warranty


  • Metal receiver, outer barrel
  • Polymer handguard, lower receiver, fixed stock


  • Must be 18 years of age to purchase
  • Airsoft gun includes orange tip (not pictured)
  • Please view build details for items included as items pictured may not be included
  • Unable to ship outside USA
  • Return policy

Recommended BB Weights

We prefer these weights for these muzzle velocities. For two main reasons. Best performance, and reliability. These BB weights will give the optimal range, and feed reliably. Going heavier than what is recommended may cause issues or PME if the magazine is not modified.

450-500FPS = 0.36g-0.40g
400-450FPS = 0.28g-0.36g
330-350FPS = 0.23g-0.25g