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Old 03-22-2011, 06:47 PM   #1 (permalink)
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modding an SL68 II gen 2?

Saw on the BST someone selling an SL68 II gen 2 that he said he had personally modded to use HPA effectively. He claims to get up to 300 FPS with HPA based on paint match on his SL68 2... is that possible? And if so, what mods are required to achieve this?
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Old 03-22-2011, 09:35 PM   #2 (permalink)
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Dunno man, but find out, I'm interested. You can use HPA with the SL-68II out the box, but I can only get about 260 with it, if there's a mod to get up to 300 I definitely want to know about it.

Of course you can try to match paint to the stock barrel, but if you are at an FPO field this mod might not work. I don't use the stock barrel, but I've been wanting to add extra oompf to the FPS. I bought shorter set screws to replace the stock velocity adjustment screw, but it didn't make a difference.
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Old 03-23-2011, 11:37 AM   #3 (permalink)
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Perhaps widening air channels for greater flow is a key point.

Maybe a higher pressure tank, say if you had a ninja reg could you muck with the shims to give you something like 1k psi output rather than 850?
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Old 03-23-2011, 02:01 PM   #4 (permalink)
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It's pretty easy to make shunt/spacers for the mainspring if you buy 1/4" brass tubing from ACE. I think that's the size.
Anyway, they sell thin brass tubing that is perfect for cutting into little rings that slip over the powertube without binding the bolt and hammer.
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Old 03-23-2011, 11:32 PM   #5 (permalink)
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my gen 2 sl shoots 290 +/- 5fps with my ninja tank outputting 850 give +/- 50 psi AND big fat marbs.....
if i shoot paint that's 675 and the like small cheap stuff it only gets to 275 give or take.

widening the air holes? sure but i'f you have ever looked at a sl's tubes you know thats not possible without HEAVY moddification and basically making another powertube for it.

now you start getting a NICE tight fit on the barrel and paint and your fps jumps up really nice...... start turning down some j and j phantom barrels

i've thought about making an ifit adapter that would go phanton barrel to sl-68 barrel...... bc you'd have to bore the sl's barrel extra deep if you were to try and use freak inserts
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Old 03-25-2011, 10:20 PM   #6 (permalink)
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When I bought my sl68 2 it fired with hpa no problem at all. I didnt even have to change the velocity - it was sitting nicely at around 265-275. Shoots beautifully with stock .691 barrel - I emailed Tippmann and asked if there was anything they could do about the rollouts, and they sent me the 'new stock' barrel for sl68 II's(they said they were still using stock from the original sl 68 2). Which is .687 IIRC.
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Old 03-28-2011, 09:07 PM   #7 (permalink)
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I have just ordered a barrel from J&J and some Hammer springs. Going to try and stretch the spring to get the velocity up.
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Old 03-28-2011, 10:29 PM   #8 (permalink)
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I saw the j&j barrel its freakin nice, i just bought a custom one from titus a little while ago tho - I need a new pump arm - the barrel OD is smaller than the stock so its really wiggly. Honestly I only got a new barrel because I liked the look of it, the stock barrel was very very accurate I found
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Old 03-29-2011, 08:47 AM   #9 (permalink)
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after you stretch the springs you need to heat them up so they will stay in that shape otherwise. you've really done nothing bc they will return to their former state.
look up how springs are made.
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Old 03-30-2011, 09:48 PM   #10 (permalink)
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I am not too worried about the spring shrinking back, it can always be re-stretched. But if, heat is needed, can I just use something like a stove element or paint stripper head gun?
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