You are allowed 2 peices of luggage and your fire arms/gun case is one of them......thay do not weigh it

From their web site: http://www.flysaa.com/

LATEST INFORMATION ON BAGGAGE REQUIREMENTS

Please note that the maximum size and weight of any baggage article that can be processed as checked baggage is as follows:
Size: 450x720x900mm
Weight: 45 Kg
Any article large than the above must be processed through Cargo.

GENERAL

Applicable on the services of SA Airways, SA Express and SA Airlink.
N.B. This Baggage Policy for SA Express & SA Airlink is always subject to confirmation at the time of departure.

DOMESTIC AND INTERNATIONAL TRAVEL-FREE BAGGAGE ALLOWANCE PERMITTED AS FOLLOWS:
Applicable on South African Airways, SA Express and SA Airlink
First Class - 40 kg (only when available)
Business Class - 30 kg
Economy Class - 20 kg
Infants : First, Business and Economy Class - 10 kg

CARD HOLDERS (South African Airways only)

Chief Executive - select extra 30 kg
Platinum - Extra 30 kg
Gold - Extra 20 kg
Silver - Extra 10 kg
Blue - 0 Extra

Exceptions:

* Between Accra / Abidjan / Addis Ababa / Dakar / Dar Es Salaam / Entebbe / Kigali / Kinshasa / **Lagos / Luanda /Lusaka/ Maputo / *Mumbai / Nairobi and South Africa/WDH via JNB
First Class - 40 Kg
Business Class - 40 Kg
Economy Class - 30 Kg
Infants: First, Business and Economy Class - 10 Kg.

*Denotes:
*When a journey begins in Mumbai - Normal baggage allowance applicable in both directions.
Infants: First, Business and Economy Class - 10 Kg.

**Denotes:
**Journey originating LOS for travel LOS to JNB OR LOS to HKG via JNB only (Not Applicable on SA1000, SA 7000 & SA8000 series).
First Class - 60 Kg
Business Class - 50 Kg
Economy Class - 40 Kg
Infants: First, Business and Economy Class - 10 Kg.

* Between Dubai and South Africa (SA Code-share Flights)
First Class - 50 Kg
Business Class - 40 Kg
Economy Class - 30 Kg
Infants: First, Business and Economy Class - 10 Kg.

* Between Comores and South Africa
Economy Class - 15 kg
Infants: First, Business and Economy Class - 7 Kg
(Also applicable for Cards Holders - No Exceptions).

N.B. Within Australia, baggage weighing more than 32 kg will not be accepted for carriage, unless the additional baggage weighing more than 32 kg is transported in a separate bag.

Please note that the maximum size and weight of any baggage article that can be processed as checked baggage is as follows:
Size: 450x720x900mm
Weight: 45 Kg
Any article larger than the above must be processed through Cargo.

For through journeys where the passenger travels partly in First / Business class and partly in Business / Economy class, the free baggage allowance for each portion of the trip shall be that applicable to the class of service for which the fare is paid.

Exception: A passenger paying a through First / Business class will be entitled to the baggage allowance for First / Business class even when accommodated in a lower class of service.

Involuntarily rerouted passengers will receive the free baggage allowance applicable to the class of service for which tickets were originally issued, even when such passenger are subsequently transferred to a different class of service.

INFANTS

10 kg of checked baggage permitted.

When an infant is carried in either a carry cot or carry seat, a baby holder including bedding, napkins, feeding bottles and sufficient food for the journey may be carried, free of charge, provided the total mass excluding the infant does not exceed 12 Kg.

When an infant is carried without the use of the aids as mentioned above, carriage is free of charge, provided the total mass, excluding the infant, does not exceed 10 Kg.