1x foot of 1 1/4" PVC
2x 1 1/4" Couplers
2x 1" to 1/2" PVC Bushings
1x foot of 1/2" PVC
1x 1/2" PVC elbow
1x 4" of 1/2" PVC
1x 3/4" PVC endcap
1/2x (half of) K25
1x 5" of 1/2" CPVC
1x 1/2" CPVC endcap
1x 1" OD steel washer
1x 1 1/2" OD rubber washer
1x 1 1/4" OD rubber washer
1x 1 1/4" OD steel washer
Assorted 6-32 Screws
Etape (or vinyl tape)
Polycarbonate (1/4" and greater thickness)
...or at least that's what I used. My most prevalent intention is for others to build off of these designs and make something better.
Here's the blaster in all it's partially disassembled glory. The stock can be held in place by a screw or removed entirely, The barrel/hopper combo is one suited to the blasters lower volume but high rate of fire.
The top is internals, the bottom is the pump slide which consists of the two 1 1/4" couplers sanded out and solvent welded together; one cut down to make room for the catch/handle. It has 4" of draw.
And a slot in the top. It is 4" long, starts 5" from the front and is 1/4" wide
The plunger rod features a basic rubber washer seal. Using all the washers, the CPVC segment, the 3/4" PVC endcap, Etape (I used a piece of 5/8" ID tubing to decrease the amount of tape needed) and a few bolts.
The 1/4" bolt segment I put on the pump slide ate into the catchface, I have since ground the threads down
The pump handle at the end of the priming stroke.
Here's the HEC 1, 2(Incomplete) and 3, just as a sneak peak I guess.
I apologize for the post-writeup writeup, HEC 2 will have a full, detailed one.
Also for the sake of discussion it can hit ~100' with the half K25; that's about 15 feet less than the HEC 1 which has a full K26 (hits ~120). Our blasters are basically more powerful than they need to be; half the spring still gets 83% of the range.
Edited by atomatron, 01 February 2012 - 11:21 PM.