PSA ROCK Speed loader v2.5

PSA Rock 5.7 Speedloader – V2.5

This is Version 2.5 of my PSA Rock 5.7 Speedloader, based on the original V2 design.

I honestly didn’t expect to release another version this quickly, but after getting a request for a model that could mount a PSA Rock 5.7 magazine to a Picatinny rail, I used the V2 speedloader as a starting point and designed an ergonomic foregrip around it.

During that process, I completely redesigned the mag catch system. The original worked well, but it was a bit bulky and sat in the way more than I liked. The new design feels significantly better in hand, stays out of the way, and retains the magazine more securely than the original version.

Once the foregrip project was finished, I couldn’t leave the standard speedloader unchanged. The V2.5 now shares the improved ergonomics of the foregrip and includes the upgraded mag catch design.

📦 Versions Available

23-Round Multi-Piece Version

I was also asked for a version capable of loading an entire 23-round magazine at once.

The main issue with making a taller one-piece loader was printer height limitations on machines like the Bambu X1C and other similarly sized printers. To solve this, I redesigned the loader as a multi-piece assembly that locks together and is secured with M3 hardware.

14-Round One-Piece Version

• Compact one-piece design
• Holds 14 rounds
• Simple and easy to print

🧩 Printed Parts

14-Round One-Piece Version (4 Parts)

• Main Body – Holds rounds and houses all components
• Plunger – Pushes rounds into the magazine
• Mag Catch Pt. 1 – Interfaces with the magazine and retains the M3x20 screw
• Mag Catch Pt. 2 – External release lever

23-Round Multi-Piece Version (6 Parts)

• Main Body Base
• Main Body Top
• Plunger Base
• Plunger Top
• Mag Catch Pt. 1
• Mag Catch Pt. 2

🔩 Hardware Required

Disclaimer: The links below are Amazon affiliate links. Purchasing through them helps support my projects at no extra cost to you.

• 1× M3x20 Screw
  https://amzn.to/4808a4t
  (Great assortment if you don’t already have M3 hardware)
• 1× 0.4 × 5mm OD × 30mm Spring
  https://amzn.to/4u5zpDl
• 1× M3x8 Screw - 23rd only
• 2× M3x5 Screws - 23rd only

🛠️ Assembly Instructions

1. Multi-Part Assembly (23-Round Version Only)

• Assemble the two main body sections together. 
  • (Depending on your filament and printer tolerances, the fit may be snug or slightly loose.)
  • (Light Sanding should help if the two halves are tight.)
• Once aligned, install the two M3x5 screws in the main body
• Fit the two plunger halves together
• Install the M3x8 screw to secure them
  • (The screw may free-spin slightly, but still holds the assembly securely.)

2 Test Fit Components

• Remove Supports from the Main Body Base
• Insert both mag catch pieces into their slots
• Ensure they move freely
• Remove any leftover support material if necessary
• Light filing may help if tolerances are tight

3. Assemble the Mag Catch

• Insert the M3x20 screw into Mag Catch Pt. 1
• Tighten until the catch pivots freely
• Holding the catch with pliers can help during assembly
• 

4. Install the Spring

• Insert Mag Catch Pt. 1 into its slot
• Insert the spring into the opposite side of the grip
• 

5. Final Assembly

• Insert Mag Catch Pt. 2 while compressing the spring
• Begin tightening the screw
• Stop tightening when:
  • The catch feels secure
  • The spring returns the catch properly after pressing

✅ Finished

Your speedloader is now ready to use.

🧪 Notes & Tips

• Stippling / Texture:
  • The grip texture was created using the fuzzy skin setting in the slicer
  • You can adjust fuzzy skin parameters (thickness, density, etc.) to change the look and feel of the grip to your preference

Recommended Filaments: Disclaimer: The links below are Amazon affiliate links.

• SUNLU PETG https://amzn.to/4uDX1iF 
  • Slightly glossy finish, but it printed extremely well and is what I used for the multi-part version. SUNLU PETG normally isn’t my preferred PETG brand, but this spool printed surprisingly well. I was even able to run it successfully in Ludicrous Mode without issues.
• PLA – Not fully tested yet, but should work fine
• ABS / ASA – Should also perform well
• Elegoo PA-HT https://amzn.to/42DYucC
  • This is what I used for the one-piece version. It looks fantastic and performs well, though tolerances tend to print tighter.
    (You may want to scale the model to around 101%, though I haven’t fully tested that yet.)
• Siraya Tech PPA-CF https://amzn.to/3ODMW61 
  • (Personal favorite for strength and finish) 
• Bambu PA-HT – Should also work well