Ok, let's take a look on the info we have. Gunbunny wants:

• Rifle types (So Sniper & Shotgun classes)
• cheap
• best not low quality
• means to increase quality
• possibly the licenses

We don't know the exact money limit, but we can check out the arsenal what is available at all!

• Sniper: Pioneer 60 - 500$, Acc 5, 10P, AP-1, SingleShot, AVA 2R (Run & Gun 39)
• Sniper: Ruger 100 - 1300$, Acc 6, 11P, AP-3, SingleAction, Ava 4R (Core 428)
• Sniper: Remington 950 - 2100$, Acc 7, 12P, AP-4, SingleShot, Ava 4R (Core 428)
• Sniper¹: Parashield Dart Rifle - 1200$, Acc 6, SPEC, AP -, SingleAction, Ava 6R (Core 429)
• Shotgun: Defiance T-250 - 450$, Acc4, 10P, AP-1, SingleShot/SingleAction, Ava 4R (Core 429)
• Shotgun: PJSS Model 55 - 1000$, Acc 6, 11P, AP-1, SingleShot, Ava 9R (Core 429)
• Shotgun: Remington 990 - 950$, Acc 4, 11P, AP-1, SingleAction, Ava 6R (Rund & Gun 42)
• Shotgun: Franchi SPAS-24 - 1050$, Acc 4(6), 12P, AP-1, SingleAction/Burst, AVA 12F (Run & Gun 41)

So, we have some things to choose from... let's look at the challengers.

Snipers and Hunting Rifles

Pioneer 60

It's cheap, it's available, it's decently accurate with a startinv char and packs a punch. For 500 bucks it is almost a disposable weapon... but surely not the prime example in the collection. It could benefit from a scope, but it has no slide to mount it easily.

Ruger 100/101

Mediocore price, but it packs more punch and is still very available. Good for something sold as a hunting rifle - decend low budget sniper. Packs a scope and shock pad already, and is well accurate for a beginning sniper.

Remington 950

The more pricy hunting rifle choice, with a smaller magazine in comparison to the Ruger, but more punch. Shoots slower also, and doesn't bring a scope or shock pad. Still, if you need the damage and are good enough to make the extra accuracy count, THIS can be your crown jewel. It can't take a Bipod or under barrel acessory though.

Parashield Dart Rifle

Not the cheapest and packing only injector dart ammo, this rifle-like weapon is your goto for nonlethal. Or to give somebody a golden shot full of H.

Shotguns

The benefit of shotguns is their ammo: loading them with either buckshot or massive slugs shouldn't make a price difference, and both bullet types can't be identified onto a gun afterwards because both deform extensively after the shot.

Defiance T-250

Your good old gas operated shotgun with a punp action backup. You can shorten it if you need to make it concealable, and it is cheap. Have a long and a short if you can spare the 1000 bucks for both. And you can license them as hunting weaponry. Not the most accurate though.

PJSS Model 55

Two-barreled shotgun with a huge punch, hunting weapon, and it can be shot as a short, 2-ammo burst. A bit pricy, but it is a weapon of style and it is accurate in contrast to most rifles.

Remington 990

A bit less pricy than the PJSS, it is again a hunting shotgun. Pump action, and it has a slide to mount a scope for some better accuracy.
^{1 - Ask your GM if this one counts as a rifle or an exotic weapon}