The remarkable and advanced Blaser Radial Locking System gives many distinct advantages .Firstly, as the bolt is directly locked into the barrel and is not locked into the receiver; it is easy to get a full-length barrel in a rifle that is 4 inch shorter in overall length. Secondly, as the bolt locks directly into the barrel, the frame receives minimum stress; this makes the Blaser lighter and portable. Thirdly, for greater system strength and durability in the Blaser Radial Locking System, stress is distributed through out a full 360° of contact. Next is as the bolt head is locked directly into the barrel, the head space is very accurately controlled. Finally, as the bolt head is free-floating, it self-trues into a concentric position within the bore, and thus it relieves stress and assures a higher degree of accuracy.

http://www.riflesnguns.com/sniper/blaser/r93 (The quote is from this site.)

Several articles are available here.
http://www.chuckhawks.com/blaser_R93_rifles.htm

I goofed and was thinking of the R95 when I wrote before. However, both have innovative breeching systems that are considered very safe. Also, there is nothing wrong with break-open and falling-block actions, of which I own and enjoy many.

I understand your concern about straight-pull actions, but I can find nothing in print that indicates the R93 is anything but safe and well-engineered.