According to Game and fish mag the top five shotguns are:

Benelli | Ethos

Dove Hunting in Argentina

The ETHOS is an elegant new semiautomatic 12-gauge shotgun that is the culmination of Benelli’s latest innovations, refinements and design superiority, all centered around the core—Inertia Driven® System.

Progressive Comfort recoil reduction system
Beautifully figured AA-Grade walnut stock
Cycles the lightest loads, even 7/8 ounce
Improved ergonomics
Two-part carrier latch for quick and easy loading.

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Franchi | Intensity

Argentina dove hunting

The Intensity shotgun is a 12-gauge that handles like second nature. It gives you the confidence to put birds in the bag.

Inertia Driven® operating system
Feels like a smaller-gauge gun
Balanced for quick shots at fast-flying waterfowl
Best choice for intense weather conditions
When you shoulder the Intensity shotgun, it’s like pointing your finger. You’ll instantly know what “right” feels like.

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Mossberg | 935 Magnum Duck Commander

Pigeon hunting in Argentina

The 935 Magnum is for hardcore hunters and tough game where magnum loads are required, with superior down range performance, over bored barrels and dual gas vent system, the 935 Magnum is also one of the softest shooting 3.5”shotguns available
MODELS: 12 Models / 12 GA / 3 ½“ Chamber / Turkey, Waterfowl, and 2 –Barrel Combo Models.

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VERSA MAX | WOOD TECH

Duck hunting in Argentina

The new standard for reliability in autoloading shotguns. VERSA MAX® shatters convention and all previous benchmarks for reliability with an action unlike any that have come before it. Proven in the field and in extreme tests of endurance with thousands of test rounds, it cycles 12-gauge loads with ultimate consistency, softer recoil and less maintenance than you’ve ever experienced.

KEY FEATURES:

Most versatile, reliable shotgun on the market.
Reliably cycles 12-gauge rounds from 2 3/4″ to 3 1/2″ magnum.
Versaport™ gas system regulates cycling pressure based on shell length.
Reduces recoil to that of a 20-gauge.
Self-cleaning – Continuously cycled thousands of rounds in torture test.
Synthetic stock and fore-end with overmolded grips and Wood Tech Finish.
Drilled and tapped receiver.
Enlarged trigger guard opening and larger safety for easier use with gloves.
TriNyte® Barrel and Nickel Teflon plated internal components offer extreme corrosion resistance.
Includes 4 Flush Mount Pro Bore™ Chokes (Probore ext: Imp Cyl, Lt Mod, WM Turkey, and Ext. Skeet)

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Savage Arms | Stevens 555

Argentina Pigeon Hunting

Savage Arms’ Stevens Model 555 Silver Over & Under Shotguns offer balance, style and reliability at an affordable price. Lightweight, low-profile aluminum receives. Beautifully finished walnut stocks and forends. Chrome-lined barrels with choke tubes for fast, easy cleaning and long-lasting corrosion resistance. Single-selective mechanical triggers. Includes five interchangeable screw-in choke tubes (SK, IC, M, IM and F). Shell extractors and manual safety. includes recoil pad and front bead sight

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Source: http://goo.gl/FzLZeq