Welcome to the Rook MAC-11 Build Guide!

Hey there! I’m unseenkiller and I'm excited to introduce you to the "Rook" MAC-11 design. Utilizing Glock magazines and reinforced by the robust PY2A PMAC platform, this firearm exemplifies strength, simplicity, and sleekness. This remarkable project eliminates the need for a feed ramp, a rare and desirable feature in the 3D-printed space.

This guide offers clear instructions, optimal print settings, and a comprehensive parts list, making the build process straightforward and efficient.

I’m genuinely grateful for your interest in this project. I hope that when you complete this build, it adds significant value to your collection and proves to be as fulfilling as it was to create. Thank you for your continued support!

(I totally didn't use AI to write ^^^ that..... I swear :^)

A special thanks to PY2A for his incredible support and contributions to our community — his dedication and kindness are truly invaluable.

Oh! and be sure to visit https://www.printyour2a.com/shop to grab up your PMAC reinforcement hardware! (don't worry, it's heckin' cheap because PY2A is a heckin' Chad <3)

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Beta Tester Credits

- AlphaCureMom69

- Festiva3D

- Pembleton and Sons'

- PLA_AK_AK_AK

- Puddle of Mudfence

- Я𝖊†Λ Ⱡ𝖎 ❽

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Print Settings

- Print all parts with 8 walls and 100% rectilinear/grid infill.

- Refer to the Print Orientation JPG for the correct build plate orientation (this is crucial for optimal performance).

- Masterpiece Arms uppers need to use the MPA labeled hood and trunnion covers.

- Use PLA+, PLA PRO or stronger filament.

Note: You should already have a basic understanding of 3D printing for this build.

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Rook Build Guide

1. Install the trigger, hammer, safety, and pistol grip. Secure the pistol grip with M5-20 SHCS screws and M5 hex nuts.

2. Attach the bolt trunnion cover and trunnion reinforcement piece to the lower using M4-30 SHCS screws and M4 hex nuts.

3. Install the pic rail into the hood, making sure to include an M4 hex nut before insertion.

4. Insert the tombstone into the hood and secure it with M4-15 SHCS screws.

5. Place 2x M3 nuts and 1x M4 nut into the top lower face behind the FCG cavity.

6. Position the MAC-11 upper onto the lower.

7. Secure the front trunnion pin using M4-15 SHCS screws.

8. Attach the hood, pic rail, and tombstone assembly to the lower and upper with M4-30 SHCS screws.

9. Fasten the lower portion of the hood with 1x M4-30 SHCS screw and 2x M3-45 SHCS screws.

10. Secure the top of the hood with 1x M3-35 SHCS screw and an M3 hex nut through the top pic rail.

11. Place half of an 8mm x 20mm Ender bed spring (die-cut preferred) into the magazine release paddle cavity.

12. Position the magazine release paddle on the spring and secure it to the lower with an M3-15 SHCS screw and an M3 hex nut.

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Bar Stock Guide

13. Thread a 1/4-20 nut onto the end of your 1/4-20 threaded rod, leaving 1mm-2mm of excess past the nut.

14. Insert the rod into the pic rail mount, then stack the Frame, Liners, and Rear Locker (or Brace Locker) onto the threaded rod.

15. Hand-tighten the 1/4-20 nut onto the excess threaded rod at the rear, then cut off the excess with a Dremel or bolt cutters (some excess is fine).

16. Use the Rear Pad or Brace Pad to tighten the rear 1/4-20 nut until the stock reaches the desired firmness.

17. Attach the Rear Pad or Brace Pad using M3-20 SHCS screws and nuts.

18. Secure the desired cheek rest to the Frame with M3-20 SHCS screws and nuts.

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Bill of Materials

Gun Parts:

- 1x MAC-11 Upper (Velocity, Masterpiece, Aves - recommended, for now.... ;-)

- 1x AR-15 FCG (complete trigger pack + safety selector / detent / spring)

- 1x PrintYour2a (PY2A) PMAC Reinforcement Kit (rear tombstone + front trunnion bent flat)

Miscellaneous Parts:

- 1x Front trunnion pin of your choice (Cavity dimensions: 8mm x 20mm)

- 1x Ender bed spring (8mm x 20mm), cut in half for the magazine release paddle

Threaded Rod:

- 1x 225mm (approximately 9" / 1ft section recommended, see step 15) section of 1/4"-20 threaded rod

- 2x 1/4"-20 hex nuts

Nuts and Bolts:

- 4x M3-20 SHCS

- 2x M3-45 SHCS

- 1x M3-35 SHCS

- 1x M3-15 SHCS

- 8x M3 Hex Nuts

- 4x M4-30 SHCS

- 1x M4-15 SHCS

- 5x M4 Hex Nuts

- 2x M5-35 SHCS

- 1x M5-20 SHCS

- 3x M5 Hex Nuts