I'm not worried about it.
I've had a couple rifles fire as their bolts slammed home, without my finger on the trigger.
One was an Egyptian contract SAFN-49 in 8mm Mauser.
The other was a 1906-vintage Remington Model 8 in .32 Remington.
Scared the bejeezus out of me both times, but I survived. I sold the SAFN-49, but I still have the Model 8.
And I still have my Swedish AG-42B. In honor of National Ammo Week this week, I've even loaded a couple hundred more rounds of 6.5x55 Swedish Mauser, which will be fed to the AG-42B in the not-too-distant future.
Here's a hint: Many autoloading military rifles, and earlier commercial autoloaders, do NOT have firing pin rebound springs. Neither the Remington Model 8, the M1 Garand, the M14, the SKS, the AK-47(some Norincos did), nor the M16/AR-15 have firing pin rebound springs. That means the firing pin can, and often does, make a small impression on a chambered round's primer. Let the bolt chamber the round like it should from the box magazine or Garand en-block clip, and there's no problem. The drag on the bolt from stripping a fresh cartridge from the magazine slows it down enough to minimize the firing pin's inertia. Mil-spec (hard) primers in the ammo take care of the rest.
How does one get a slamfire? Simple. Chamber a commercial round, or a soft-primered handload, by hand, then let the bolt fly home into battery. Voila'!
The Swedes were a resourceful lot, and saw fit to include a firing pin rebound spring in the design of the AG-42B Ljungman. This kept the firing pin fully retracted during the bolt's movement, and the only thing that would allow the firing pin nose to protrude into a cartridge primer was a proper hit by the trigger group's hammer.
WWI and WWII-vintage milsurp rifles, be they bolt actions or autoloaders, have many years under their belts. Striker springs in Mausers and M1911 Schmidt-Rubins go brittle and break, I've that happen to me a couple of times. Same goes for the springs found in an average M1 Garand or AG-42B Ljungman. I now buy an assortment of replacement Wolff springs each time I pick up a new toy. If you find and purchase one of these delightful old warhorses, do yourself and those around you a favor. Get the rifle checked out by a competent gunsmith who is familiar with the weapon type you have. Chances are you'll be buying at least a new recoil spring. Have somebody show you a used M1 Garand recoil spring compared to a new one. You can see the difference in just the lengths alone.
You wouldn't find an old Packard or DeSoto and just start tooling around in it without a bit of inspection and preventive maintenance. Springs in autoloading rifles are not a forever thing, even the ones wrapped around a firing pin inside the bolt of an AG-42B Ljungman. Regardless of the rifle type, have it inspected. It'll save you a lot of grief in the long run. Having stood by helpless as I watched a gentleman blow the top of his head off accidentally with a cosmoline-packed runaway SKS, I'm a firm believer.
Oh, yeah - if you're still leery of that dangerous AG-42B, let me know. I've got room in the gun safe next to my own AG-42B.
And Kim duToit should know better than to publicize scary blow-up gun stories, told second-hand, without at least a bold caveat or doing a little homework. He can click on Dean Speir's website for an example of how to do it the right way.
