Design
The SPAS 12 was designed to function primarily as a semi-automatic firearm, with the pump-action mode used to reliably fire low-pressure ammunition such as tear gas rounds or less-lethal bean bags. Switching between firing modes is done by pressing a button under the foregrip, and sliding the foregrip slightly forwards or backwards until it clicks into position. Pump action mode was however rather slow and ungainly when compared to traditional pump action guns due to the complexity of the changeover mechanism and the friction of the fore-grip with the hand-guard.
The SPAS-12 has a magazine cut-off feature that can prevent the loading of a new round from the internal magazine when the gun is cycled. This allows the operator to load a specialized round into the chamber without going through the entire magazine first. Another unique feature of the SPAS-12 was the hook seen on folding stock variants. This hook could be rotated in 90 degree increments so that it would fit under the user's forearm when the stock was extended. With the stock supported under the forearm the gun could theoretically be fired with one hand, allowing the user to fire around cover or use their support hand for other tasks. In reality the sheer weight of the gun, which is substantially higher than a more traditional shotgun, made such usage unlikely if not impossible for the average user. In addition the difficulty in aiming and coping with the recoil of one handed use consign such usage more towards the realms of Hollywood fantasy than practical utility.
Early SPAS-12 models featured a lever-type safety, but over time it would begin discharging the firearm when switched on or off. This was eventually recalled by Franchi and replaced by a push-button crossbolt safety. Many guns remain with the lever-type safety so caution should be used.
The barrel of the SPAS 12 was externally threaded to accept a wide variety of attachments, from chokes to gas grenade launchers. One interesting and particularly rare attachment, called a "diverter", spread shot vertically or horizontally. All barrel attachments are considered rare, and demand premium pricing on the secondhand market.
Read more about this topic: Franchi SPAS-12
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