G'Day Fella's,

As a firearms dealer here in Oz, I just went and looked at the www.herrons.com.au (the Australia's Merkel Agent), web site.
They have a full listing of Merkel RX Helix rifle, in .223 to 9.3 x 62 in bore diameter.
The RX Helix kind of reminds me of the exceedingly popular and successful, Sauer 200 series of rifles!

dr deer, I find it hard to believe that you have much credible engineering knowledge of anything, let alone firearms! Not to mention, actual experience with such things!!!
Best you stick to what you know best and anyone that has had any exposure to you will know what I mean by that.

Double Doh!!
Homer