Lithgow Arms Licensed F90 In Door Gas Rifle
The F90 with the Low Power Bolt for indoor fields
The KWA F90 In Door is a 6mm gas blowback airsoft bullpup rifle, officially licensed from Lithgow Arms. It fires semi and full auto from one two-stage trigger at 330–350 FPS, takes a 30-round F90 magazine, and has an extended top Picatinny rail, a folding non-reciprocating charging handle, one-pin takedown and a tool-less hop-up, with KWA’s Low Power Bolt (LPB) for indoor fields.
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The F90 In Door is out of stock right now. These KWA gas rifles are the closest match today. Check each one’s FPS against your field’s limit.
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What is the F90 In Door?
The F90 is a gas blowback bullpup, officially licensed from Lithgow Arms. Compared with the bullpup design it builds on, it has a shorter length of pull, an extended top Picatinny rail, extra Picatinny space at the 3 to 6 o’clock positions and a folding, non-reciprocating charging handle.
It also has a modular stock/receiver-to-barrel interface with one-pin takedown, an expansion slot in the trigger housing, a waffle-pattern magazine, an ambidextrous magazine release, a mock adjustable gas block and an ambidextrous, adjustable ejection port. Inside, it shares components with KWA’s GBB line, with an improved hop-up and bolt carrier.
The F90 In Door adds KWA’s Low Power Bolt (LPB), which lowers BB velocity to 330–350 FPS to meet indoor field rules. It suits indoor fields and works well outdoors too.
- Officially licensed from Lithgow Arms
- Two-stage trigger: half pull for semi, full squeeze for full auto
- ALO pull tab locks out full auto
- Tool-less hop-up
- Extended top Picatinny rail, plus rail space at 3 to 6 o’clock
- Integrated sling swivel attachment points
- One-pin takedown, ambidextrous magazine release
- Low Power Bolt (LPB) for 330–350 FPS
F90 In Door Features
Tool-less Hop-Up
Easily adjustable hop-up.KWA’s adjustable hop-up lets you fine-tune backspin for accuracy with any BB weight.
F90 ALO Trigger
The trigger is the fire selector.Half a pull fires one round, and a full squeeze fires full auto. The ALO (automatic lockout) pull tab at the bottom of the trigger stops it from travelling all the way to full auto.
Low Power Bolt (LPB)
Included for indoor fields.The KWA Low Power Bolt lowers muzzle velocity to 330–350 FPS to meet indoor field limits, with the same reliable performance.
Integrated Sling Swivel Points
Built in.Sling attachment points are built into the design for quick, secure sling setup.
Picatinny Rail for Accessories
Mount it your way.A Picatinny rail at the 3 o’clock position is ready for a light, laser or other accessory.
F90 In Door Specifications
| Performance | |
|---|---|
| Power system | Gas blowback |
| Velocity | 330–350 FPS |
| Rate of fire | 11+ rounds per second |
| Firing modes | Semi and full auto, set by the two-stage ALO trigger |
| Magazine | F90, 30 rounds |
| Hop-up | Tool-less, updated gas hop-up |
| Bolt | Low Power Bolt (LPB) |
| Dimensions | |
| Length | 31.5 in, fixed stock |
| Height | 7.3 in |
| Outer barrel | 19 in |
| Inner barrel | 11.5 in |
| Weight | 7.78 lb |
| Build | |
| Platform | Bullpup rifle |
| Stock | Fixed |
| Rails | Extended top Picatinny, Picatinny at 3 o’clock |
| Charging handle | Folding, non-reciprocating |
| Controls | Ambidextrous magazine release, adjustable ejection port |
| Muzzle | Standard (orange mock suppressor installed) |
| License | Lithgow Arms |
| Collection | Professional Training |
Which magazines fit? See the KWA magazine compatibility chart.
What comes with the F90 In Door
In the box
- Lithgow Arms Licensed F90 In Door gas blowback rifle, with the Low Power Bolt (LPB)
- One F90 30-round magazine
- Orange mock suppressor, installed
You will also need
- Gas for the magazine. KWA sells green gas
- 6mm airsoft BBs
- Silicone oil for magazine seals
- Full-seal eye protection
Popular add-ons
How the F90 In Door works
Gas blowback rifles reward a little know-how. Here is what to expect.
Gas blowback, explained
Green gas is stored in the magazine. Each trigger pull releases gas that fires the BB and drives the bolt back, which gives you bolt movement and recoil you can feel.
Because the gas lives in the magazine, healthy magazines mean a healthy rifle. Keep their seals oiled and fill them correctly.
The two-stage ALO trigger
The F90 has no separate selector switch. The trigger does the job: half a pull fires one round in semi-auto, and a full squeeze fires full auto.
The ALO (automatic lockout) is a pull tab at the bottom of the trigger. Engage it and the trigger cannot travel far enough for full auto.
Standard or In Door?
Both versions are the same rifle. The standard F90 shoots 380–400 FPS. The F90 In Door comes with KWA’s Low Power Bolt (LPB) for 330–350 FPS, to meet indoor field limits. Fields set velocity limits, often lower indoors than outdoors, so check yours and confirm at chrono.
Filling a gas magazine
Each shot uses some of the gas in the magazine to fire the BB and cycle the bolt.
- Hold the magazine upside down and the green gas can upside down and vertical.
- Press the can straight down onto the magazine fill valve until it stops taking gas.
- Load BBs, insert the magazine and you are ready.
- Gas cools as you shoot. Let magazines warm up between strings and keep them out of direct sunlight.
Hop-up, explained
Hop-up puts backspin on the BB so it lifts and flies flatter and farther. Too little and BBs drop early. Too much and they climb.
- Start with the hop-up at its lowest setting.
- Fire a few shots at a target at your usual distance.
- Add a little hop at a time until BBs fly flat before they drop.
- Back it off if BBs start to rise. Re-check whenever you change BB weight.
F90 vs F90 In Door
The same Lithgow Arms licensed gas bullpup. The In Door version comes with the Low Power Bolt for lower velocity.
| F90 | F90 In Door | |
|---|---|---|
| Velocity | 380–400 FPS | 330–350 FPS |
| Bolt | Standard | Low Power Bolt (LPB) |
| Best for | Fields that allow 380–400 FPS | Indoor fields, and outdoor play too |
| Magazine | F90, 30 rounds | F90, 30 rounds |
| Trigger | Two-stage with ALO | Two-stage with ALO |
| Rate of fire | 11+ rounds per second | 11+ rounds per second |
| Length | 31.5 in | 31.5 in |
| Weight | 7.78 lb | 7.78 lb |
F90 In Door care and parts
- Put a drop of silicone oil on the magazine seals now and then to keep them sealing well.
- Store gas magazines in a cool, dry place and never in direct sunlight or a hot car.
- Check feed lips and seals before each game, and do not drop magazines on hard surfaces.
- Wipe the gun down after each game and keep the inner barrel and hop-up bucking clean.
- Use silicone oil only. Avoid petroleum lubricants on seals and rubber parts.
Manuals and diagrams are in the Manuals & Diagrams library.
F90 In Door FAQ
What is the KWA F90 In Door?
A 6mm gas blowback airsoft bullpup rifle from KWA, officially licensed from Lithgow Arms, with a two-stage ALO trigger, a tool-less hop-up and Picatinny rails, plus the Low Power Bolt for indoor fields.
How many FPS does the F90 In Door shoot?
KWA lists it at 330–350 FPS. Fields set velocity limits, often lower indoors than outdoors, so check yours and confirm at chrono.
How do I switch between semi and full auto?
With the trigger. Half a pull fires one round, and a full squeeze fires full auto. Engage the ALO pull tab at the bottom of the trigger to lock out full auto.
How many rounds does the F90 magazine hold?
30 rounds. One F90 30-round magazine is included.
What is the Low Power Bolt?
A KWA bolt that lowers BB velocity to 330–350 FPS to meet indoor field limits. The F90 In Door comes with it.
What is the difference between the F90 and the F90 In Door?
Only the bolt. The F90 shoots 380–400 FPS. The F90 In Door has the Low Power Bolt for 330–350 FPS.
Does it come with an orange tip?
Yes. It ships with an orange mock suppressor. The black tip shown in some photos is sold separately.
Can I pay for the Lithgow Arms Licensed F90 In Door over time?
Yes. Choose Klarna at checkout to split it into 4 interest-free payments, or Affirm to pay over time. Both are subject to approval. See Payment Options.
Do I earn KWA Rewards points on the Lithgow Arms Licensed F90 In Door?
Yes. KWA Rewards members earn 1 point for every $1 on orders of $50 or more, so the Lithgow Arms Licensed F90 In Door earns about 550 points, worth $11.00 in store credit (50 points = $1). See KWA Rewards.
Is the F90 In Door covered by a warranty?
Every KWA gun is backed by KWA, with warranty support and in-house service in California. Protection Plus adds extended warranty coverage and a repair plan with no repair fee, discounted parts and free return shipping. See the Protection Plus page for plan details.
