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RA Tech Hop up unit and "blue" rubber troubles


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#1 Darkstar29

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Posted 19 April 2013 - 11:31 PM

Howdy Everyone,

Here is the stink, just recently got my LM4 (USA) worked on to replace the stock hop up unit and rubber that got trashed. The teeth broke and the rubber itself decided to give me the middle finger. I was convinced by a nearby shop to try out the RA Tech's offerings hop up, packing "blue type", and a tightbore. After the installation, took it up to the field to get the settings done. Thats when things went sideways, bb's flying way right from the barrel, the bolt not sitting all the way in the chamber, and occasional double feeding/misfeeding.

After closer inspection of the said parts, I noticed the hop up smashing against the feed ramp, and when I made adjustments it changed the position of the nub off center when hop is applied. Im a little skeptical retuning back to this shop, can anyone can refer me another tech or shop I can take it to. I live in Martinez, CA but I attend classes and do some work out in the Santa Clara/Milpitas area so I frequent the AEX shop nearby.

Any help would certainly be appreciated.

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#2 BeachEMT

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Posted 19 April 2013 - 11:53 PM

I had issues with the bolt not seating all the way when I was building my CQB upper. It looks like you hop up is too far into the receiver also. I used some Madbull barrel shims to move the barrel farther forward away from the receiver.

#3 BoobieM4H

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Posted 20 April 2013 - 05:19 AM

I live in san jose..just saying..pm me

( o Y o )



#4 Darkstar29

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Posted 20 April 2013 - 04:10 PM

Thanks Beach, and boobie I sent yeah a PM..




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