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Old 08-11-2011, 01:06 PM   #21 (permalink)
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I hope you put a nice big champher on the ID of that barrel. Mine chopped the crap out of All Star and Marbalizer with a straight phantom barrel with no angle to funnel the paint. My machine is set up to run a new insert with an angle for A5 barrels. Should fix the issue.
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Old 08-13-2011, 05:59 PM   #22 (permalink)
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Originally Posted by Mayvik View Post
Looking great so far! Make sure you don't underbore that barrel too much if you want to shoot FS...
Do you know what the ID of a barrel has to be for it to take FS without busting them?

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oh that's just devilish, nice work
Thank you!

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This is a neat project RR, I'll definitely be following this.
Thanks O'Lane, hope not to disappoint!

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Originally Posted by Echo View Post
I hope you put a nice big champher on the ID of that barrel. Mine chopped the crap out of All Star and Marbalizer with a straight phantom barrel with no angle to funnel the paint. My machine is set up to run a new insert with an angle for A5 barrels. Should fix the issue.
Thats still on my "to do" list. I want to test it out before I permanently install the barrel.

Progress:

The breach is finished. Looks the same to you?


That was the goal!
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Old 08-13-2011, 08:26 PM   #23 (permalink)
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What size tube are you using for the mag? And does it have a weld seam? I'm anxious to find out if you'll do a better job than I did trying to get it to feed reliably.
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Old 08-13-2011, 09:33 PM   #24 (permalink)
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What size tube are you using for the mag? And does it have a weld seam? I'm anxious to find out if you'll do a better job than I did trying to get it to feed reliably.
It is steel and doesn't have any weld seams because its an extruded tube. Its 1" square and has a gauge thickness of 15 (.0703")

my goal is to copy the SMG60 breach and mag design, thats why I just opened up the breach on my milled piece. I've never had feed issues with any SMG60, so I think its worthwhile to copy that design but modified for .68 cal.
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Old 08-13-2011, 09:44 PM   #25 (permalink)
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Where did you find that? My local Industrial Metal Supply doesn't sell extruded steel.
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Old 08-13-2011, 09:54 PM   #26 (permalink)
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Where did you find that? My local Industrial Metal Supply doesn't sell extruded steel.
I work at a machine shop.
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Old 08-13-2011, 10:27 PM   #27 (permalink)
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Originally Posted by Runningriot View Post
Do you know what the ID of a barrel has to be for it to take FS without busting them?
I want to say .682-4 or so is about the min but I'm not close to 100%. I think all the dedicated FS guns out there have ginormous barrels from the factory, so maybe someone who's played around with bored barrels or breech-loading will have better insight? You could try pm'ing CCMachinst too, what with him working on the sniper gun he may know.

It may not just be busting the round itself, but compressing the fin section down may reduce performance if it's permanently deformed. The polymer isn't as springy as paintball shell.
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Old 08-14-2011, 03:26 PM   #28 (permalink)
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i use a 690 barrel for fs
688 is about perfect
686 is getting to the point where you will lose reliability with them breaking
lapco makes a 683 barrel for tiberius... BUT it's rifled, and i haven't gottent ot handle one to actually meausre across the rifling and the wells of the rfiling.

you get a nice clean and FAST round down the chambe using a 690 barrel anything above that and it bounces around.
the 688 id just catches those fs that are slightly out of round and hold them just a hair less then snug.
686 needs to be hand feed and not bolt pushed into the breech or you'll shave the fins on oblondged ones or possible crack the shell

all barrels used where checked with plug/pin gauges +.0002 and -.0002 i think ZZ class right?
did't have a bore gauge that was available.

so my final statment would be get a 688-690 barrel for your fs
flasc did a similiar stuy and came up with 686 as perfect if i remember correctly, but the article is is posted around
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Old 08-17-2011, 07:11 PM   #29 (permalink)
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Update
Magazine is pretty much finished. Need to do some fine-tuning on how it mates up to the breach. Might have to tweak the breach as well depending on now it feeds the clips. I replaced the receiver tube with a later version because it has the safety notch in it and I prefer that style. I also milled the clip pawl locator dowel pin and added a chamfer on the ID of the barrel. Have to see if thats enough before I make the barrel permanent. Can hardly wait to have this running. After looking at it and getting to hold the SMG with the magazine on, I think the 30 round capacity "might" be a tad too much.

Big thanks go out to Echo for the pawl and Bacci for some odds and ends.






Picked up an old school "raincover". Really interested in trying this thing out


To do:
finalize magazine fit.
fine tune breach
port barrel for "raincover"
mill constant rate spring channel in receiver
fit front grip
test
test
test
test
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Old 08-18-2011, 06:04 PM   #30 (permalink)
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have you thought something like a clip catching dump pouch on the side of your marker.
liek this:
Testing Tiberius First Strikes in a Tippmann SMG-68. Auto Sniper!! WOOO - YouTube
saves you from picking up or losing clips all the time lol
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