Skeleton Key - Master Key Silly Shell cho Nerf

Be prepared for those pesky super zombies with Skeleton Key! A pump action, Silly Shell, master key that mounts to the Picatinny rail under the barrel of your blaster. This is my first blaster design. It uses most of the same hardware as Wildstyle along with Silly Shells, both designed by @Sillybutts. Because of this, you can expect the same performance that Wildstyle gets. It is a relatively simple build so let's begin. 

Printing

Since Skeleton Key used Wildstyle hardware there are some reused printed parts along with the Silly Shells. These parts are the PlungerHead_A, PlungerHead_B, Catch, and the Ejector_Button. I have not tested the other ejector styles. The links for these files are bellow.

• Wildstyle - Shell Fed Shotgun Pistol (Nerf Homemade) by Sillybutts | Download free STL model | Printables.com
• Silly Shells for Homemade Nerf Blasters by Sillybutts | Download free STL model | Printables.com

This blaster takes about 600 grams of filament. I recommend PETG for its strength. You will need a printer with a build volume of at least 256 x 256 x 256 mm³. The larger bed is required only for the bottom clamp pieces. They must be oriented at 45 degrees. I used Tree Supports for all the parts. Everything except the pump grip was printed with 4 walls at 30% infill. The pump grip was done with 3 walls and 20% infill. There are several parts that have a logo and logo less version.

Hardware

This is the hardware list. The components from the OOD kit are marked along with their quantities. Links to what I used are below the chart. The amount of 30mm bolts you need is determined by how many clamps you use to mount skeleton key. Two bolts for every clamp. 

Part

Total Hardware

Hardware in the OOD Kit

Additional Hardware

1/8th shock pad

1

1

0

Dash 016 O-ring

1

1

0

Dash 123 O-ring

2

2

0

9657K644 spring

3

3

0

10-32 x 10in threaded rod

2

2

0

10-32 hex nut

2

2

0

10-32 acorn cap nut

2

2

0

4-40 x 3/8in flat head screw

3

3

0

1.5 x 4in Plunger Tube


1

1

0

4in K25 spring 

1

1

0

M3 X 30mm socket head screw

4 to 8

1

3

M3 X 25mm socket head screw

5

0

5

M3 X 20mm socket head screw

6

6

0

M3 X 16mm socket head screw

1

0

1

M3 X 12mm socket head screw

2

0

2

M3 X 6mm socket head screw

8

0

8

M3 X 4mm socket head screw

1

0

1

M3 hex nut

12 to 16

0

0

M3 X 4 X 5mm heat set insert

12

0

0

Lubricant

1

1

0

• Sillybutts Wildstyle Silly Shell Pistol Hardware Kit – Out of Darts
• 130Pcs Threaded Inserts Heat Set Inserts Kit M3x4x5 Brass Insert Nut with Soldering Iron Tip for 3D Printed Plastic Materials: Amazon.com: Industrial & Scientific
• https://www.amazon.com/HELIFOUNER-Pieces-Socket-Washers-Stainless/dp/B097Y6KCVW?pd_rd_w=pzYx9&content-id=amzn1.sym.528bfdfa-ea96-478b-a7d9-043e650836af&pf_rd_p=528bfdfa-ea96-478b-a7d9-043e650836af&pf_rd_r=9QDQVC7YZH2MX9Z7TZ90&pd_rd_wg=gjpBk&pd_rd_r=ab1c44fa-60af-4885-a35d-a591594ea9f4&pd_rd_i=B097Y6KCVW&ref_=pd_basp_d_rpt_ba_s_2_t&th=1

Assembly

I have made an assembly guide on my YouTube Channel. 

 If you have any questions feel free to ask here. [email protected]  

Tools

• Soldering Iron
• Metric Allen Keys
• Philips screwdriver 
• Tweezers
• Exacto/utility knife
• Lubricant (Included in Wildstyle Hardware kit)
• 1 Silly Shell

Thank you for taking a look at my first blaster design. If you build Skeleton Key, please post it. I would love to see it. 

Updates 

• 3/3/25 Added STEP and Fusion files
• 3/5/25 I fixed some mistakes with the hardware list
• 3/14/25 Linked the tutorial. Sorry I forgot to post it earlier.