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Supermax 500 Modification

A writeup.

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#1 bobafan

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Posted 20 January 2008 - 09:58 PM

Alright.
I know there aren't very many of these left, but I decided to make a writeup anyway.
Diagram of parts

Start with your stock SM500.

Remove the round orange pieces which reside where I have circled.
Posted Image

I used my dremel and just cut them off, but it can also be done with a pocketknife and patience.

Next unscrew the yellow pieces on the handle.
Then remove all of the screws. Don't forget the ones the yellow piece were covering.
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Take off the shell and take a good look at the trigger assembly.
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Now, take the pump and tank assembly out. Be carefull not to lose any springs.

Cut the barrel off where the orange muzzle piece ends and set aside the pump and tank.

Now remove the white plastic from the muzzle by any means necessary.
I made parallel cuts with my dremel and pried off the bits.
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Take out the spring and peg thing. Then drill out the inside of the muzzle.
Change this.
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To this. (mine isn't quite done)
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Make sure your barrel materiel fits snugly.

Get that tank piece back out and cut the white barrel so it is flush with the purple shell.
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Put the muzzle piece on the barrel, then put in your barrel materiel as far as possible. Pull out the muzzle.
Now you know the distance between the back of the muzzle and the front of the tank.
Mark it.
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Then wrap e-tape around the exposed barrel piece until it is flush with the back of the muzzle.
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After cutting off any excess tape, jam the muzzle into the white barrel piece. It should be tight.
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Wrap a bit of tape around the outside of the white tube so it will be snug with the shell.

Put everything back together.
There you go.
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I get similar ranges to an AT2K

Questions? Comments?

WARNING: Do not plug the pump. It is very easy to damage the valve beyond repair.

Thanks to Nerfer34 for parting with this rarity.

Edited by bobafan, 20 January 2008 - 11:20 PM.

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thaygor: all i remimber is pumping it hard and shooting than trying to pump again

---

<death09>my girlfriend broke up with me and sent me pix of her and her new boyfriend in bed
<ktp753>ouch.
<death09>yeah.i sent them to her dad

#2 rokor

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Posted 20 January 2008 - 10:03 PM

Awesome mod, I dont have time to read it all but from what I have, its pretty clear and easy to read. What about the accuracy and vellocity, is it basically the same performance as a 2K in all aspects?
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#3 bobafan

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Posted 20 January 2008 - 10:13 PM

From what I can tell it's about the same as an at2k,
I haven't been able to use it much though because it is currently 12*F.
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thaygor: all i remimber is pumping it hard and shooting than trying to pump again

---

<death09>my girlfriend broke up with me and sent me pix of her and her new boyfriend in bed
<ktp753>ouch.
<death09>yeah.i sent them to her dad

#4 Forsaken angel24

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Posted 20 January 2008 - 10:27 PM

Thats awesome. A rare gun modification!
A worthy addition to the Modification write up directory.
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#5 bpso86

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Posted 20 January 2008 - 11:15 PM

Excellent mod, although a bit different than mine. You missed me dual-wielding these at the latest Ohio war. It was awesome.

Not to hi-jack or anything, but a 1/2" cpvc coupler fits right inside of the white part that you cut off. I just wrapped some e-tape around the end, shoved it in there and glued it in. I can throw up some pictures for reference if you want. Your way looks very clean, though.

In my experience, they get slightly better than at2k ranges. They also have the magical ability to hit Diablo through anything he's standing behind. :unsure:

Oh yeah, and definitely don't plug the pump. You're right about that. These things are the loudest, most powerful airguns I've ever heard too.

Edited by bpso86, 20 January 2008 - 11:16 PM.

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#6 Lynx

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Posted 20 January 2008 - 11:43 PM

Watch out because with a good seal, these things are a beast (OHNO was cold and those things were powerful).
How many pumps?
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#7 bobafan

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Posted 20 January 2008 - 11:46 PM

2-3 pumps before the op valve does its thing.
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thaygor: all i remimber is pumping it hard and shooting than trying to pump again

---

<death09>my girlfriend broke up with me and sent me pix of her and her new boyfriend in bed
<ktp753>ouch.
<death09>yeah.i sent them to her dad

#8 frost vectron

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Posted 21 January 2008 - 03:43 AM

A 3/4" to 1/2" CPVC Reducer fits right on top of the white portion of the "barrel" as well.

Posted Image

I do like how you kept the muzzle intact, though! These babies are rare. :unsure:

Edited by frost vectron, 21 January 2008 - 03:47 AM.

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#9 bobafan

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Posted 21 January 2008 - 11:04 AM

Yeah, mine is much sexier.

What did you do to that mav?
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thaygor: all i remimber is pumping it hard and shooting than trying to pump again

---

<death09>my girlfriend broke up with me and sent me pix of her and her new boyfriend in bed
<ktp753>ouch.
<death09>yeah.i sent them to her dad

#10 nerfer34

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Posted 21 January 2008 - 11:19 AM

Thanks, good job.
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#11 frost vectron

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Posted 22 January 2008 - 02:24 AM

Yeah, mine is much sexier.

What did you do to that mav?


Haha, perhaps. I do like how my orange rings are intact, though.

The maverick has the cocking handle reinforced.
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Latest Modification: The Professional

"I am a leaf on the wind--watch how I soar" - Hoban "Wash" Washburne, Serenity.

#12 bobafan

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Posted 22 January 2008 - 06:42 AM

How did you manage to take off the orange rings without damaging them? They were pretty stubborn for me.
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thaygor: all i remimber is pumping it hard and shooting than trying to pump again

---

<death09>my girlfriend broke up with me and sent me pix of her and her new boyfriend in bed
<ktp753>ouch.
<death09>yeah.i sent them to her dad

#13 frost vectron

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Posted 23 January 2008 - 04:58 AM

I didn't take them off at all. I figured that I wasn't going to plug the pump on such a rarity anyways, so I did everything without opening it.
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Latest Modification: The Professional

"I am a leaf on the wind--watch how I soar" - Hoban "Wash" Washburne, Serenity.


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