This istructable is to show how to upgrade the previously posted "simple k'nex pistol" to an AP2 slide-locked pistol. (still single shot).
Differences: obviously, instead of pulling back the firing pin, when you slide back the pistol slide, it slides back the firing pin, then locks it it with the new lighter trigger design. Also, the grip has been strengthened dramatically, and improved sights have been added. This version can also support heavier elastics for an exponentially stronger shot and hyper-accurate range with small-medium projectiles (green, white and blue rods-best with white)
Again, the tension on the connector on the firing pin is too much, so superglue or tape the crap outta it so itll stay on.
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Step 1: Base Deconstruction: Deconstruction of the Pistol and Frame
This one's easy. first, remove all the elastics, then the trigger. You will later alter this and the slot in which the connector blocks the barrel for a smoother, more hair-pin style trigger.
Step 2: Remove Grip and Frame From Upper Barrel Components
Easily detach the upper reciever (barrel assembley) from the frame.
Step 3: Remove the Grip From the Frame
Detatch the grip from the frame, it will later be reinforced.
Step 4: Deconstruct the Top Part of the Reciever
Detatch the upper part of the reciever/barrel assembley, so it looks like the pic below. discard the parts you removed.
Step 5: Begin Alterations: the Trigger
Simply modify the trigger so the white rod that supports the orange connector to the second postition (45 degrees) on the red connectors.
Step 6: Modify the Frame
This one is simple. just flip the tan connectors on the white rods the other way around, then add the three yellow rods to the upper frame.
Step 7: Modify the Grip
Move the small black connectors with the ball on top to the two yellow rods directly behind where they used to be. Then remove two of the five existing red connectors, and make the rod, spacer, and hinged connector component. it will come into play later.
Step 8: Modify the Lower Reciever/barrel Component
This is slightly more complex. detach the long gray rods at the front of the barrel. remove all three of the white connectors, and add in three yellow connectors in their place. Where the single gray spacer was, add in another single blue spacer. This will allow more room for the improved trigger to funtion, making it a smoother and lighter pull.
Also, it is critical that you add the green rods exactly where they are shown, as to not impare the structural strength of the gun.
Step 9: Build the Slide
Now, just build exactly what you see in the bottom pic. If you want, to improve the sights, replace the back gray connector to a black connector that is used to hold the elastics onto the firing pin. It allows for a ball-and-cup type sight for easier target aquisition.
Step 10: Modify the Firing Pin
Below is a side by side comparison of the old and new firing pins. the new one has the two gray rods to slide into both the bottom of the slide, and the barrel.
Step 11: Begin Assembley: Frame and Trigger
Snap in the yellow rod for the trigger to the 90 degree slot on the yellow connectors.
Step 12: Attach the Frame and Grip Together, Then to the Barrel
Sorry I didnt take a more detailed pic, but attach the grip first so the 45 degree rod on the yellow connector with 2 gray connectors, then again, to the bottom of the frame as you did with the last pistol.
Attach the frame to the pistol also like you did the last one, making sure to attach both of the hinged connectors to the corresponding green rods protruding from the bottom of the barrel/reciever.
Step 13: Attach the Slide
Using the two long gray rods that were slid through the gray connectors at the bottom of the barrel, attach them to the top of the barrel/reciever. Attach them to the corresponding snap locations on the three yellow connectors.
By the way, the two small black connectors on the back of the sliding rods are to guide the firing pin elastics to keep them from pulling down on the firing pin when loading.
Step 14: Slide in the New Firing Pin
slide in the new firing pin, black connector down into the top and bottom chambers of the back of the pistol. You have to have the trigger in the depressed position to slide it all the way through if you have assembled everything perfectly.
Step 15: Attach the Elastics
Attach all three elastics for: the trigger, the slide, and the firing pin. Anchor them all to the locations specified in the bottom pics.
Step 16: You're Done!
for now, this is the most up-to-date version of the knex pistol. If you have finished it correctly, you have successfuly upgraded your simple knex pistol to the AP2.
Now, go and shoot stuff.
Step 17: Loading
If you cant figure it out, let me help you. Slide back the slide ALL THE WAY until the back two gray connectors of the slide hit the small black connectors on the slide rods that redirect the firing pin elastics. To make it easier, hold down the trigger so the pin can move all the way back without making it more difficult.
then, load a white rod into the muzzle, aim with the sights, and witnes the very surprising accuracy that comes with your upgrade to an AP2 pistol.
Step 18: Custom Upgrades: AP2 Mk.2
Here, I just modified the rear sights, shortened the thumb guard (back) and the rear of the slide.