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Bronc's tape mod

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#1 OOG671


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Posted 14 March 2011 - 05:35 PM

Okay for those of you who are interested in the tape mod here you go.

Took this off pbnation sticky:http://www.pbnation.com/showthread.php?t=2418234

Broncís Bolt Pin Mod:

It's just a simple tape mod for your bolt pin.. After experimenting he was able to reduce about 1/3 of the overall volume in the dump chamber without any effect on his HPR pressure or velocity.

It changed the sound signature a bit to; people told him it started to sound like a Marq. Weird

The right way to do it would be to start at the rear of the dump chamber and wrap tape about 2/3 of the way up towards the o-ring. Then put another roll next to it and go up about 1/3 of the way up. That's it.

Of course tape isn't exact science, but his new kit will have a different size dump chamber and be more efficient out of the box.

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Basically, the dump chamber holds A LOT more air then it really needs to shoot the gun, so I started working on reducing the volume. The results were amazing!

Normal: 2000psi from a 45ci/4500psi tank gets 3 pods
Mod: 1200psi from a 45ci/4500psi tank gets 3 pods.

Just electrical tape, but it's a smaller size then the normal black stuff. See, start at the back of the dump chamber. Go 2/3 of the way up, and then make another roll about 1/4 the way up. Lube and go back and shoot.

The key to test this:

Shoot your gun normally over a chrono at 285fps. Add the tape. Shoot it over the chrono again. If the velocity stays the same, you're good to go. If it drops, you put on a little too much tape. You can obviously experiment with adding more or less and raising or lower the pressure to your liking.

Or you can just buy the 4B kit that was designed by Bronc.

Here: http://www.thinairpa...ll.com/4bkit.pl
Pro Jerseys FST Feedback:http://www.techpb.co...showtopic=61562
Muppet #72, Christian Baller

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