About: I make K'nex guns, specializing in semi-automatic, RBG-Slingshot hybrid systems which i use in most of my guns. Note: I am not responsible in any way for any damage, injury, or death caused by my Instructab...
This is my 15th K'nex gun I'ble and 30th I'ble altogether. This is my MMP-1 (Masterdude Machine Pistol model 1). It does not use my semi-auto mechanism but uses one based off of my MAR-4 mech.

More Instructables by Me

  • Slide action
  • Removable magazine
  • True trigger
  • Trigger guard
  • Compact
  • Relatively low piece count
  • Looks?
  • Range/Power not all that awesome
  • Not semi-auto

Step 1: Main Body: Components

Make the following in the quantities stated. Each component is assigned a letter for further reference:

Image 1: Make 1. A
Image 2: Make 2. B
Image 3: Make 2. C
Image 4: Make 3. D
Image 5: Make 1. E
Image 6: Make 1. F
Image 7: Make 1. G
Image 8: Make 1. H
Image 9: Make 1. I
Image 10: Make 1. J
Image 11: Make 1. K

Step 2: Main Body: Assembly

Follow the instructions and images:

Image 1: Add white and blue rods to A and B.
Image 2: Add C and D, and more white and blue rods as well as gray and red connectors.
Image 3: Add D, E, F, G, H, I, and J, and 2 blue spacers.
Image 4: Add C and D, and gray and red connectors.
Image 5: Add B and K.

Step 3: Magazine

First make 2 of each in the first 3 images, 4 of the 4th, and 1 of each from images 5 and 6.
Image 7: Add white rods as shown.
Image 8: Add/connect the other parts as shown.
Image 9: Cover with the last pieces to finish.

Note: Image 6 is the pin which holds the ammo back until the mag is inserted in the gun. It is not shown until the last step.

Step 4: Operation

After putting the rubberband on a mag as shown in Image 1, insert the ammo (gray connectors, Image 2) and put the pin in to hold them in place. Then add the rubberbands onto the gun as in Image 3. Then insert the mag into the gun as shown and pull out the mag pin. now pull back the slide as in Image 4, and pull the trigger to fire. Then repeat pulling the slide back and pulling the trigger as needed.

Warning- This may cause harm or injury if misused. Do not point it at people. I am not responsible for damage, injury, or death caused by this instructable. Always treated it as armed.



    • Trash to Treasure

      Trash to Treasure
    • Pie Contest

      Pie Contest
    • Tape Contest

      Tape Contest

    11 Discussions


    7 years ago on Introduction

    It would improve performance greatly if the pin wasn't directly attached to the slide, and likely also improve firing rate.

    1 reply

    I know. Maybe in my next guns with firing pins I'll try to make them not attached to the slide. As for the firing rate, if you want fast, then you want my other guns.

    The "M" (Machine) is just because of the resemblence to Machine Pistols and kind of because it is created for fast firing because of the large(-ish) mag and the slide which should make the firing speed relatively fast.

    Also I will continue to make the semi-auto's but currently I am unable to post more guns so for a while (until summer ends) I will not post any semi-auto's.

    DJ Radio

    7 years ago on Introduction

    Your gun would be better if the pin wasn't so heavy, and if it was longer. Maybe make the barrel longer too.

    1 reply
    MasterdudeDJ Radio

    Reply 7 years ago on Introduction

    It probably would but I wanted it to be very compact so I tried to make the barrel and pin (and therefore the back of the gun) as short as possible so the gun still works.