It's basically just a standard sniper rifle with 20 round magazine, shorter barrel, made from ceramic, +2 power, and recoil comp. The damage is a bit much (except for armored trolls), but I figured on killing whatever I hit...which is what a rifle is for (delivering a massive blow, not like those piddly M16s
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It really doesn't matter if they're broken or not. A good gunsmith can work up just about anything you want. Caliber conversions (+2 power), custom magazines (real life: modifying FN-FAL 20 round mags to work in SAIGA AK chambered in 308/7.62x51), shorter barrel (obvious), bullbarrel (obvious), recoil comp is really a muzzle brake and/or pad (or spring mechanism in the stock). The price is actually quite high given the hourly rate in the book; usually stuff like that runs $2-4k US (SR seems to follow today's rates, but with nuyen). I have no problem with high prices though; it's a +1 sword equivalent.
I also have no problem downgrading it to a 9S weapon based off a "sporting" rifle. Heck...I could have him build it off a Garand, M14, or FAL. A modified FAL wouldn't be much of a stretch (http://dsarms.com/prodinfo.asp?number=SA58B21CM ...a great 800 meter rifle). These are "rifles", not "assault" rifles. Assault rifles fire light to medium cartridges and are typically intended to be used at a maximum of 300 yards (effective). The distinction is in the cartridge, not the form (contrary to what the politicians would have you believe).
One thing they missed: accuracy improvements. Bedding the barrels, barrel fluting, free floaters, trigger tuning, action smoothing and so forth. At close ranges, that stuff really doesn't matter. But when you're slinging a projectile 500, 800, 1000, or more meters...it makes a huge difference. For example, standard AK-47 is calibrated for 6 MOA. This yields a group 6" in diameter at 100 meters. Multiply 6" by the first digit of the range to get the diameter (ie: 12" at 200, 18" at 300). It is generally accepted that 20" is "man sized". Therefore, at 500 yards, we're talking a 30" diameter -- more than enough to miss simply due to the gun's mechanics causing the deviation (doesn't account for shooter error, which increases it). Compare the 1 MOA rifle's group with that of the AK.
I'll PM you the PC in a bit.
--cREbralFIX