Here is my knex MP5K . It's my entry for the MW2 contest. AND IT WON!
Its a good replica with these features:

*Shoots Dark Gray Connectors
*Angled Removable mags (normal or high cap)
*Realistic
*Good sights
*Fore-Grip
*Optional upper receiver with rails (Not Posted - Just replace 3rd and 5th layers with whites and yellows)
*Good for a replica or side arm

Review: https://www.instructables.com/community/Knex-MP5K-review/
PLEASE COMMENT RATE AND SUBSCRIBE!!!

Step 1: Build a Whole Lot of Stuff

Build a whole lot of stuff

Step 2: Assemble the Gun

Assemble the Gun

Step 3: Magazines

Normal on left, High Cap on right!

Step 4: Loading the Mag Into the Gun Properly

Insert the MAGAZINE (not clip) into the gun correctly for it to shoot right!

Step 5: Mods

Here are mods made to the gun that have been made by me, or you guys.
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Mag release, with a few other attachments. Made by: osi
https://www.instructables.com/id/Mag-release-for-shadowninja31s-MP5k-The-Instru/

Step 6: Your Guns

Here are some of your versions of this gun!
Pic 1 - John Copper's version
Pic 2 - Ymerej88's version
Pic 3 - knex gun builder's version
Pic 4 - osi's version. He added a mag release that works!
Pic 5 - Dr MonkeyMan's version