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How to fix: bbs jamming on feed ramp/chamber


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#21 BoobieM4H

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Posted 17 June 2013 - 06:44 PM

View Postnetpoc, on 17 June 2013 - 05:22 PM, said:


That was my initial concern, which was quickly answered as there is tons of room behind the brass collar.
Sweet!!!

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#22 netpoc

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Posted 17 June 2013 - 08:44 PM

"Oooh cool ideas! I really wish I was still at school, that way I could do this on a lathe. Perhaps using a hacksaw VERY CAREFULLY could give the groove needed?"

I don't see why not. Light pressure and a steady hand. I used a dremel with a thin metal cutting wheel.

Edited by netpoc, 17 June 2013 - 08:47 PM.


#23 BoobieM4H

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Posted 17 June 2013 - 09:50 PM

Did the oring behind the hop up unit .I must admit .this is way legit yo. Thumbs up to netpoc yo..i like this alot..very similar to the wa/g&p hop unit and how it has the oring that holds the adjustment wheel in place.
Posted Image

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Edited by BoobieM4H, 17 June 2013 - 09:51 PM.


#24 BeachEMT

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Posted 17 June 2013 - 11:27 PM

View Postnetpoc, on 17 June 2013 - 05:19 PM, said:

I will second that! The pressure from the pipe cutter most likely will deform the inner diameter of the barrel.

Already tested it before and it DOES NOT deform the barrel. Trust me, I'm an engineer, I've already checked it out. Just don't use an industrial model. I used a tiny one I picked up from Lowe's which is meant for cutting refrigerator cap tubing.

That aside, I totally agree that people should use what ever tool they have available and are comfortable using.

#25 BoobieM4H

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Posted 17 June 2013 - 11:41 PM

And I'm a plumber..just saying..I cut brass and copper all day long..and I got a bad a** deburring tool too

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#26 -wigs-

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Posted 19 June 2013 - 06:20 AM

Yeah I wouldn't recomend a pipe cutter especially if your doing this on a stock barrel. The rat inner is harder and took me a dremel to cut to cqb length, the stock barrel will deform on the inside.
Best bet is a dremel or like someone stated a table saw that will just kiss the barrel. You will need a jig whig would be simple to make. Take a 2x4 and make a chanel length wise just wide enough for the inner to fit and be able to turn freely. Clamp that down and the rest you should be able to figure out.You could however mark where to cut and then lightly scribe the line with a pipe cutter. Going to have to do this this weekend.

Edited by -wigs-, 19 June 2013 - 06:24 AM.


#27 FlagBonz

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Posted 20 June 2013 - 05:20 AM

Just making sure I understand....... Are these mods intenended to help decrease the double-feed type jams that seem to be common?

What other mods are recommend? Hop up, etc.

I am mainly interested in reliability. I am using this to train with and can't seem to get my lm4 to run from day to day.

Can someone make a list of the aftermarket parts/mods that seem to be the "best". Might be a nice separate thread.

#28 optimuskmg

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Posted 20 June 2013 - 09:14 AM

Got a few highly coveted evo2 hopup units in the mail today, also got a danco #5 o ring to try and cut a groove in the barrel for it, but I have a question for boobie, do you suggest the oring fix or the barrel crimp? I think I can do both, but which works better? I would rather do the o-ring but is it as good a fix?

#29 BoobieM4H

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Posted 20 June 2013 - 09:51 AM

View Postoptimuskmg, on 20 June 2013 - 09:14 AM, said:

Got a few highly coveted evo2 hopup units in the mail today, also got a danco #5 o ring to try and cut a groove in the barrel for it, but I have a question for boobie, do you suggest the oring fix or the barrel crimp? I think I can do both, but which works better? I would rather do the o-ring but is it as good a fix?
Go the oring route..much more legit imo

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#30 optimuskmg

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Posted 20 June 2013 - 09:55 AM

Can you give me
Some specs on where you placed it, and what oring diameter? Rough mesurements would be appreciated, no need to I crazy

#31 thatguyx

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Posted 20 June 2013 - 03:35 PM

I wonder how long before KWA sneaks this "update" in.  nice work to the both of you.

#32 netpoc

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Posted 20 June 2013 - 04:14 PM

View Postoptimuskmg, on 20 June 2013 - 09:55 AM, said:

Can you give me
Some specs on where you placed it, and what oring diameter? Rough mesurements would be appreciated, no need to I crazy

Just make a mark with a permanent marker behind the brass collar when the hop up unit is assembled. See my pics. Then stretch a appropriately sized o-ring over the barrel and slide down into the notch. The idea is to keep everything in place by eliminating the movement of the brass collar on the inner barrel.

#33 BoobieM4H

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Posted 20 June 2013 - 04:54 PM

Hey netpoc.. tried to pm you..but couldn't. .anyways..do you mind if I do a how to vid demonstrating how to do this oring mod? Of course credit would be given

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#34 netpoc

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Posted 20 June 2013 - 05:10 PM

No, by all means, go for it!

#35 BoobieM4H

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Posted 20 June 2013 - 05:22 PM

View Postnetpoc, on 20 June 2013 - 05:10 PM, said:

No, by all means, go for it!
Kool..thanks bro

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#36 BoobieM4H

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Posted 20 June 2013 - 11:15 PM

Here's a little quick how to.
https://www.youtube....be_gdata_player

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Edited by BoobieM4H, 20 June 2013 - 11:15 PM.


#37 netpoc

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Posted 21 June 2013 - 05:57 AM

View PostBoobieM4H, on 20 June 2013 - 11:15 PM, said:

Here's a little quick how to.
https://www.youtube....be_gdata_player


Very nice. Thank you... I put a comment on there and I'll throw it on here too. A c-clip can also be used in place of the o-ring. That was my original idea but I didn't have an extra laying around so I used an o-ring. But with that said either one will work.

#38 BoobieM4H

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Posted 21 June 2013 - 06:18 AM

View Postnetpoc, on 21 June 2013 - 05:57 AM, said:


Very nice. Thank you... I put a comment on there and I'll throw it on here too. A c-clip can also be used in place of the o-ring. That was my original idea but I didn't have an extra laying around so I used an o-ring. But with that said either one will work.
Was thinkng the same too..but didn't have one..but I have hella orings laying around haha..thanks for letting me do a vid on it.

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#39 optimuskmg

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Posted 21 June 2013 - 09:23 AM

I did the o-ring mod, worked out really nicely thanks netpock, good catch, I want to test it some more but I have a mason in my backyard who is rebuilding my chimney and would most likely not take well to me firing my lm4 in the backyard. Haha. Anywho, not to difficult and it works great, I know you guys are nuts about the o-ring numbers so I used a Danco #5 oring from ace hardware, the individually wrapped ones, cost me 50 cents. Will stop back in after some definitive testing but this looks like the sure fix

#40 optimuskmg

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Posted 22 June 2013 - 12:55 PM

Ran a few mags through the rifle after I did the mod, it didn't work. I think my outer barrel is loose though, il have to run some trial stuff.




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