AIA #4 M10 Ejection

[ireload2]

I large part we agree that the M10 is not a Milsurp or an Enfield product, but as the only sucessful civilian bolt action based on an updated Lee Enfield design it has some interesting points.
Also previous postings about this rifle have served to warn those considering buying one for competition that it is unlikely to be accepted in service rifle category, so this may have saved a few prospective buyers from an expensive mistake..

In the US the Springfield Armory M1-A is used in service rifle competition.
It is not an M-1. It is a much modified commercial clone of the M-14 yet it is permitted in military matches. It is possible that at buyer of the AIA rifle can have his rifle modified or perhaps AIA will modify one of their production models to meet the service rifle criteria. If that happens the M10 rifle would be competing along side #4s.

I have always been curious about the competitions fired with the #4 rifles. What inspection is required of the rifles for competition?
1. Trigger pull
2. Sights
3. Weight
4. Barrel
5. Caliber
Are #4s required to compete against civilian versions of the currrent service rifle such are the AR 15 types used in the US?

The M10 could easily be modified to meet most of the #4 requirements, especially the sighting requirements. What is to stop a competitor from modifying a #4 with a modern bench rest quality barrel and chamber?
On one of the other threads there was a #4 modified to use what looked like a Canjar trigger. Are there any restrictions on these modifications?