Ge600/MEC/Unique/Esprit Carabine. Free floating barrel???

[RobinC]

just to return to the original poster:-

You are using a 20+ year old design rifle action and trigger, technology has moved on in those years a lot, and I know the MEC project EC is 2600 Euro cost alone, there will also be extras, such as butt plate, possibly sights, unless you use the old ones.

And, you will still have a 20 year old rifle in a new stock, and a stock that you will need to develop, and you will probably need custom clamps for your barrel.

This is not a ten shot sort out job, it will need many hundreds of rounds of testing, and the associated range time to get the best from it, there are clamp locations to test, and torque settings to ascertain, and even on its best, then it may not (probably won't) be any better, tighter groups, than it is now!
Technology has developed, lock time are faster, triggers are better, sights are better, butt plates are different, you would be better selling your complete rifle, and buying a new modern one, have a modern short action, faster lock time, a modern trigger, modern sights, and a modern stock and butt plate, why do you think the top world level shots use the latest technology, and if you sold the old one, for not a lot more than the cost of doing the same with your old action! The MEC project stock is top tech, why put a 20 year old design in it?

The KK500 is the modern pick of the bunch, it is more ergonomic, better equipped, good butt plates, sights, etc, its proven, and cost effective, and it gets the results!
My wife has a KK500, because she also shoots 300 mt (with a Keppeler) she wanted her KK500 in a Keppeler stock, so she had her two rifles the same feel and balance, this was a project done with the help and cooperation of both Walther, and Keppeler, it shoots superbly, but I can tell you there was a lot of work, testing, and time, to achieve the end result.

My advice, just sell the Centre 10, and buy a new modern well equipped rifle.

Have Fun
Robin