I have seen guys shooting open class high power using AR's that use a bolt instead of being semi-auto.  I was wondering, how is this done?

Is the actual bolt modified to accept the handle?

I am assuming the gas system is disabled in these rifles, am I correct?

Is there a book out there that explains this modification?

I am just curious how this is done.

Thanks.
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Was it a side charging upper? Both [url=tp-commerce.techpro.com/pantherarms/shopexd.asp?id=478]DPMS[/url] and ASA sell side charging uppers and rifles.

-ed,FWIW I just noticed that your in AZ, and so is American Spirit Arms.

Most spaceguns use a butstock with adjustable cheekpiece that interferes with the standard charging handle.  These guns usually use a modified upper and bolt carrier to put a charging handle on the right side, and still operate semi-auto.  This will probably continue as the commercial side-charging handles are on the left, making them difficult to operate while in position.  Not all spaceguns use this modification as some owners are comfortable with a GI butt, and some adjustable cheekpieces accomodate the standard charging handle.

Mill the reciever, drill and tap a hole in the bolt cerrier, install a bolt, turnoff the gas.. Springloaded(forward assist) bolt gun......

 Might be Cal. legal.....

Thanks.