TO BUILD THE IMPROVED VERSION, THE C4.1 ------> [https://www.instructables.com/id/The-C41-Lego-Semi-Automatic-Crossbow/ ]
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For the C4.1 Semi-Automatic Crossbow (coming in a few weeks), these changes will be made: The top of the magazine holder will be altered to be more sturdy (The C4's hasn't broken yet, but its just a precaution), the firing capacity will be increased to 5 rounds, a stock will be added, and a bipod will be added.
Step 1: Main Forward Body
This step will build the base of the front half of the crossbow.
Step 2: Handle
This step completes the handle, which is the base for the back of the gun.
Step 3: Trigger Mechanism
This step builds the trigger mechanism and puts it on the handle piece.
Step 4: Building More of the Back
This step just builds more of the back pieces.
Step 5: Part of the Firing Mechanism
This step builds some parts of the main mechanism..
Step 6: Filling in the Front
This step will finish filling the front of the crossbow with pieces, as well as make part of the area for the magazine to go in.
Step 7: The Rest of the Mechanism + Connecting the Parts
This step will finish off the rest of the firing mechanism, as well as connect the front and back pieces of the crossbow.
Step 8: Rear Cover + Sight
This step will build the cover on the mechanism and the rear sight with the tactical rails.
Step 9: Firing Runway
This step will build the firing runway.
Step 10: Magazine Cover + Forward Sight
This step builds the cover which will go over the area where the ammo comes out of the magazine, as well as the forward sight.
Step 11: The Magazine
This step builds builds the magazine.
Step 12: Front Handle
This step builds the handle in the front of the gun.
Step 13: Magazine Rod
This step builds the magazine rod.
Step 14: Ammo + Counterweight Rubberbands + Firing Rubberbands
This step shows how to make the ammo, and where to put the counterweight and firing rubberbands.
Step 15: Loading
Before loading, you need to lubricate the insides of the magazine, all around each ammo piece, the firing runway, and the magazine rod (the brick part not the technic part) with a thin coating of Vaseline. Then, you can load in the order which the pictures show.