A cheaper option may be to replace the mechanical workings of your M14, so that it fires on semi auto to an acceptable level.
I'll let Yith sound off about the electrical option 
The semi-auto problem can be cured by fitting a new cut off lever, http://www.fire-support.co.uk/product/g ... -marui-m14 , (£11 + £5 P&P), as per this thread; viewtopic.php?f=13&t=7419&hilit=m14+semi+auto+problem
If you're a non-techy type, buying the parts for a semi-only MOSFET controller and making it yourself is a non-starter.
The simple trigger contact replacement MOSFETs use the existing mechanical selectors, and are simple enough to build from a few parts, but AFAIK, all semi-only MOSFET units use a microcontroller that needs to be programmed.
yes, no4_sonuk is correct
In my M1, the trigger contacts and cut-off lever were both buggered by extreme semi auto usage.
The solution was to:
1) replace the cut off level with a steel one... this should last a lot longer
2) replace the trigger contacts with new ones that hadn't got holes burned through them
3) add in the simple mosfet circuit, which will stop the arcing across the trigger contacts and make them last much longer.
...no4_sonuk...
Yiths got Lee Enfields on the brain!
A Proud Member Of 'Team Spleen!' who play mainly at Gunman Airsoft, Tuddenham, Suffolk.
Where could you get this Mosfet circuit? Hardware store? What exactly does it look like? I am obviously not to experienced with electronics but I'd like to get my M1 Garand shooting semi auto only. Thanks!
Do a search on google for "airsoft mosfet" and start reading.
http://www.google.co.uk/search?aq=f&sou ... et&qscrl=1
There's commercially available ones or you can make your own... not hard if you know how to solder as there are only two components.
