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Hardware Kit for Scarlett Mk1 blaster

From 42,00

The hardware kit for the Scarlett Mk1 foam dart blaster includes all screws, o-rings, inserts and small parts needed to build the blaster.

Note: While the use of the Delrin plunger is technically optional, we highly recommend using it because almost all our printed versions failed at some point.

The Scarlett uses custom 3d printed magazines only.

Check out the build guide video.

Premium machined aluminum barrel - Standard barrel for this kit.
The one piece Delrin plunger is our standard and we highly recommend using it.
Magazine hardware
Choose how many magazines you want to build. One set includes the RMP mag spring, heat inserts and screws needed to build one magazine.

14 in stock

Scarlett Mk1 Hardware kit – HARDWARE ONLY!

This is the hardware kit for the Scarlett Mk1 foam dart blaster which includes everything you need to build this beauty yourself.

The amount of hardware needed will vary on your build, but everything is included to build the blaster in any configuration shown in the pictures.

Make sure to check out the files as well as the build guide video before purchasing the parts.

This kit includes ONLY the hardware. You will need to purchase the files and print them yourself in order to complete the blaster!


The Scarlett Mk1 is a mag in grip, spring powered, pistol foam dart blaster which was build for LARP. It features a mag release, see through mag and grip (ammo counting), a working slide lock and a slide return spring. It was build around the RMP5 spring and gets max LARP-performance by German standards (100 fps cap). With this it is also perfect as a secondary for any CQB game scenario.
Since it was build for LARP it looks more realistic then other blasters. If you choose to have it print in dark colours and/or paint it to look more realistic you have to be aware of the consequences when using this outside of private LARP games. If you want this for your Nerf collection I highly recommend using bright colours. Rainbow Mods&Props can not be held responsible if you choose to do otherwise.

Scarlett hardware list

– This list includes all the hardware you could possibly need. Depending on your build you might need less. –


8x M2x5mm countersunk – use: grip scales
4x M2x8mm countersunk – use: Mag bottom
1x M2.5x6mm raised countersunk – use: mag follower (you can re-use old Nerf internal screws)
2x M3x8mm countersunk – use: Turnaround
1x M3x20mm countersunk – use: Pusher
2x M3x20mm cylinder head – use: catch assembly

Heat inserts

7x M2x4mm (Ruthex) – use: 4 x mag/ 1 x slide lock/ 2 x picatinny Rail
5x M3x5,7mm (Ruthex) – use: 2 x turnaround/ 1 x pusher/ 2 x slide


trigger: 1x 0,5mm x 17mm x 5mm (OD) – or similar
mag release: 1x 0,3mm x 7mm x 4mm (OD) – or similar (very small spring)
catch: 1x 0,25mm x 15mm x 4,8mm (OD) – or similar
main spring: 1x RMP 5 Gecko spring (1,6mm x 110mm x 17,7mm (OD)) – or similar
slide return spring: 1x RMP Gecko Slide Return spring (1,1mm x 76mm x 19mm (OD)) – or similar
magazine spring: 1 RMP Magazine spring – or similar (e.g. Worker mag spring for short mags)


1x 9x2mm
1x 19×2,5mm


plunger pad: 1x 20x2mm
plunger: RMP one piece Delrin plunger is recommended, but you can try and print/make your own.
plunger tube: 1x 25×0,5x68mm – we use a carbon tube, but you can use any tube with 0,5mm wall thickness

catch tube: 1x 48mm KS140 brass OR 48mm 14x1mm aluminum (still being tested)

barrel: 1x RMP Scarlett/IMP barrel 161mm 16×1,5mm

PVC mag window: 1x RMP Scarlett/IMP mag window (61,7×9,6x2mm)



– Blaster not included
– Modify blasters at your own risk
– Rainbow Mods and Props is not responsible for any damage done to your blaster or yourself in the process of modification.

– WARNING: Installing this mod changes the look of your blaster and although this does not necessarily look like a real firearm, it could be mistaken for one. As such it is completely the responsibility of the buyer in how it is handled. When installing mod kits make sure to add necessary precaution (orange tip, etc.) according to your local law and use responsibly.

– Rainbow Mods and Props cannot be responsible if anything occurs as a result of this being handled as a real gun.
– Rainbow Mods and Props has no affiliation with Hasbro, Nerf or any of their respective affiliates.

Weight 0,3 kg
Dimensions 20 × 15 × 5 cm


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