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Airsoft Engineering Services

At Pro Airsoft Supplies we have some of the best airsoft engineers in the country. If you want to take your rifle to the next level we have created several packages for you to choose from depending on the upgrade desired. We also do gun repair that costs £15 per half hour of labour plus parts. If you need it done while you wait in store (And it can be done) the price is raised to £25 per half hour of labour. If you can't drop your rifle off personally to the store don't worry, we can have it collected from you via courier.

DMR Upgrade - £300 (£425 for Computerized MOSFET)

Airsoft DMR Upgrade


The Pro Airsoft Supplies DMR package is the one-stop-shop option for turning your Airsoft Rifle into a top-notch Airsoft DMR. Using carefully selected high-end upgrade parts, we disassemble your rifle down to its base components, carefully clean the parts that will be kept and then meticulously install the upgrade parts, ensuring perfect fitment and clearance at every stage.

This process utilises every ounce of our Engineer’s talent and experience to create a rifle where every part functions harmoniously and smoothly for maximum efficiency and performance out in the field.

The “base level” package includes a “standard” high-power MOSFET which improves power delivery to the motor by bypassing the mechanical trigger switch for all but a microscopic fraction of power to tell the MOSFET when to turn on. This gives your gun substantially better trigger response and completely mitigates the risk of your trigger unit eroding away from electrical arcing or melting from high-current flow.

Also available as an option for some guns (Contact us for details) is an upgraded computerised MOSFET unit. This unit is programmable for pre-cocking, firing delay and other features whilst also giving you a shorter, lighter and more precise trigger pull for enhanced accuracy. We will pre-program the unit for you before shipment to match your specific requirements, but if needed the MOSFET can be reprogrammed in the future for a small fee.

The “Default” power level for the DMR package is 1.87J (450fps with a 0.20g BB), but we’re fully cognisant that different sites have different power restrictions, so please let us know exactly what power you need and we’ll build the rifle to that level.

In the same vein, some users prefer 7.4v and some prefer 11.1v LiPo batteries, so if you have a particular preference, please let us know and we’ll tune the rifle to that voltage, otherwise we’ll build the rifles to run on 11.1v batteries as standard.

  •          Machined-Steel Black-Oxide-Coated Gearset in 16:1 ratio
  •          Custom-tuned 22-TPA motor with high-strength Neodymium-Iron-Boron Magnets
  •          Custom-lightened Fibre-reinforced Polyamide 6 piston with a full rack of high-toughness steel teeth
  •          Ultra-durable and lightweight Polyoxymethylene (POM) Pistonhead with bearing
  •          Custom-made Temperature-resistant Hydrogenated-Nitrile-Butyl-Rubber (HNBR) Pistonhead-Oring
  •          Steel “Tornado” style rotating-shaft bearing spring-guide
  •          Aluminium Air-seal (O-ring) Nozzle
  •          High-durability solid-steel bushings for long-lifespan
  •          Scatterplot™ Laser-Cut Sorbothane & Neoprene impact-absorbing pad
  •          Stainless-Steel custom-polished Cylinder
  •          High-grade Japanese-steel variable-pitch spring
  •          6.03mm stainless-steel Tightbore with Prometheus “Flat” hop and Bridge-type bucking
  •          Choice of Standard MOSFET for efficiency & Trigger Response OR High-Tech computerised MOSFET-unit shipped pre-programmed for optimum functionality

High-Speed Upgrade - £200 (+£125 for computerised MOSFET, +£40 for 6.03mm Stainless Steel Tightbore + Hop Rubber)

Airsoft High Speed Upgrade


When you need to lay down some serious firepower in a short time span, the Pro Airsoft Supplies High-Speed package is all you need. Combining nigh-unbeatable trigger response with a scorching rate of fire, whether you’re going room-to-room and need to get the first shot off or keeping the enemy suppressed through a rain of pain, this package will do you proud utilizing the magic combination of an ultra-high-torque motor and ultra-high-speed gears.

The Engineer will carefully tear your gun down to its component parts, clean and tune all the original parts that will be kept before meticulously installing the upgrade parts, ensuring perfect fitment and clearance at every stage.

We can tune your gun to run on either an 11.1v or 7.4v LiPo battery – just let us know which and we’ll work our magic to give you the optimum experience possible to fit your needs and situation.

You might be wondering why we use an M120 spring when the power limit needs to be 350FPS or less – The reason for that is simple; because these guns deliver such high rates of fire, a regular M100 spring physically can’t push the piston forwards fast enough before the sector gear comes round to cycle it again! This is called “Premature Engagement”. By using a more powerful spring combined with short-stroking, this allows the gun to remain at the allowable power level while completely eliminating the chance of premature engagement occurring.

The “base level” package includes a “standard” high-power MOSFET which improves power delivery to the motor by bypassing the mechanical trigger switch for all but a microscopic fraction of power to tell the MOSFET when to turn on. This gives your gun substantially better trigger response and completely mitigates the risk of your trigger unit eroding away from electrical arcing or melting from high-current flow.

Also available as an option for some guns (Contact us for details) is an upgraded computerised MOSFET unit. This unit is programmable for pre-cocking, firing delay and other features whilst also giving you a shorter, lighter and more precise trigger pull for enhanced accuracy. We will pre-program the unit for you before shipment to match your specific requirements, but if needed the MOSFET can be reprogrammed in the future for a small fee.

  •          Machined-Steel Black-Oxide-Coated Gearset in 12:1 ratio, short-stroked by 4 teeth
  •          Custom-tuned 22-TPA motor with high-strength Neodymium-Iron-Boron Magnets
  •          Custom-lightened Fibre-reinforced Polyamide-6 piston with a full rack of high-toughness steel teeth, correspondingly short-stroked
  •          Ultra-durable and lightweight Polyoxymethylene (POM) Pistonhead with bearing
  •          Custom-made Temperature-resistant Hydrogenated-Nitrile-Butyl-Rubber (HNBR) Pistonhead-Oring
  •          Steel “Tornado” style rotating-shaft bearing spring-guide
  •          High-strength ball-bearing bushings (8mm only, 6mm/7mm will be bushings)
  •          Scatterplot™ Laser-Cut Sorbothane & Neoprene impact-absorbing pad
  •          High-grade Japanese-steel variable-pitch M120 spring

Krytac High-Speed Upgrade - £275 (£400 for Computerized MOSFET)

Krytac Upgrade


When you need your Krytac Rifle to be the best Assault Rifle it can be, look no further than the Pro Airsoft Supplies Krytac High-Speed package. Utilizing the optimal components, customised to fit the demanding Krytac Gearbox where necessary and combined with the top-of-the-line upgrade parts from LayLax-Prometheus, we’re confident that there might be no finer Krytac Rifle anywhere on the planet.

The Engineer will carefully tear your gun down to its component parts, clean and tune all the original parts that will be kept before meticulously installing the upgrade parts, ensuring perfect fitment and clearance at every stage.

We can tune your gun to run on either an 11.1v or 7.4v LiPo battery – just let us know which and we’ll work our magic to give you the optimum experience possible to fit your needs and situation.

You might be wondering why we use an M120 spring when the power limit needs to be 350FPS or less – The reason for that is simple; because these guns deliver such high rates of fire, a regular M100 spring physically can’t push the piston forwards fast enough before the sector gear comes round to cycle it again! This is called “Premature Engagement”. By using a more powerful spring combined with short-stroking, this allows the gun to remain at the allowable power level while completely eliminating the chance of premature engagement occurring.

Also available as an option is replacing the Krytac standard “simple” ‘FET with an upgraded computerised MOSFET unit. This unit is programmable for pre-cocking, firing delay and other features whilst also giving you a shorter, lighter and more precise trigger pull for enhanced accuracy. We will pre-program the unit for you before shipment to match your specific requirements, but if needed the MOSFET can be reprogrammed in the future for a small fee.

  •          Machined-Steel Black-Oxide-Coated Gearset in 12:1 ratio, short-stroked & Customised to fit the unique Krytac Nautilus™ Gearbox Casing
  •          Custom-tuned 22-TPA motor with high-strength Neodymium-Iron-Boron Magnets
  •          Custom-lightened Fibre-reinforced Polyamide-6 piston with a full rack of high-toughness steel teeth, correspondingly short-stroked
  •          Ultra-durable and lightweight Polyoxymethylene (POM) Pistonhead with bearing
  •          Custom-made Temperature-resistant Hydrogenated-Nitrile-Butyl-Rubber (HNBR) Pistonhead-Oring
  •          Prometheus™ O-ring Air-Seal Nozzle and Aero-Cylinderhead
  •          Prometheus™ Krytac Series Stainless-Steel 6.03mm Tightbore
  •          Prometheus™ “Purple” hop-up rubber
  •          High-grade Japanese-steel variable-pitch M120 spring