I do have one larger caliber rifle battle rifle than my AR-15 and AK-47. It is an FN49 in 8mm. The surplus 8mm ammo is pretty cheap so that may have to do for my large caliber rifle until better times financially arrive.
The FN-49 is the direct predecessor of the FN-FAL (Fusil Automatique Leger). The guns are very, very, similar. I have an FN49 too, and I like it a lot - but I hate how the gas tube extends only halfway under the handguards. When you want to shoot corrosive ammo, this becomes a huge problem.
If you look in the background of my pic (and yes, there is a background), you will see an EAI FAL that we have converted back to the FN49's loading system (10rnd fixed magazine, top stripper clip loading). This was done for California residents. Incidentally, if a CAL-FAL rifle owner moves out of the state, we will replace the 10rnd mag with a detachable 20 and ship it back to them for free.
Oh, one more thing. You can definitely tell when a FAL gets "slide lock". An AR15's BHO works the same way - you can't tell it's locked back unless you look into the receiver since charging handle is not reciprocating (and it better not be if you are behind it). With both, you can feel it. Sort of a slam, lock kind of feel.
The SAIGAs are excellent rifles, but they are not in the same leage as the FAL. The AK design is prized primarily for its ridiculously low cost of production, then for its durability, reliability, etc. The FAL has it the other way around.
PS: WEG, AFAIK the rear sight is just the standard IMBEL sight on those two rifles. it may be a trick of the light - that, or something else is "giving you extra elevation"
PPS: Yes, Dr. Dickie, that's me in the pic. But I don't blame you for not noticing me.