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Hi guys Many of you already know this, but I wanted to post this for those that didn't...... Saiga shotguns are very popular now, with good reason: they are very fun to shoot; there are tons of aftermarket parts to customize them; they can carry up to 30 rounds of firepower (I prefer 8 or 20); and using defense loads, they are very reliable. For Class 2 manufacturers, being able to legally convert a Saiga to full auto turns this semi auto shotgun into a real monster. Yeah, you go through rounds very quickly and full auto isn't really that necessary in most situations.....but it's fun. Converting an S12 into a short barreled shotgun (shortening the barrel) changes the ability of the gas system to cycle the weapon. There's up to 4 holes drilled into the top of a Saiga 12 shotgun. Hot gases enter these holes and press back against a piston that, in turn, pushes the bolt carrier rearward, cycling the action and ejecting the shell, as well as loading the next round. When you shorten the barrel, the hot gasses don't have as far to go before they exit the front of the muzzle. So there's less time this gas is under high pressure and able to operate the piston. They call this duration of high pressure "dwell time". So what does this mean for the shooter? In order for a gas operated auto loading firearm to properly function (whether semi or full auto), it requires enough gas pressure over a long enough period to overcome the weight of the bolt carrier, any friction it takes to move the carrier and the resistance of the recoil spring. Polishing the internals definitely helps against friction. So does using higher power rounds, which produce more gas. But what if you want to shoot cheaper bulk ammo? One technique is to enlarge the ports in the barrel to allow more gas. Another is to physically move the gas block (where the gas enters from the barrel) rearward, which increases dwell time. Many of the higher end Class 2 manufacturers do this. An often overlooked technique by many new shooters is giving it a solid base to shoot from. You've probably seen videos where someone "limp wrists" a pistol and it doesn't cycle. That's because the action didn't have enough of a foundation to push back against. The same is true for shotguns and rifles. Let's see it in action: http://www.youtube.com/watch?v=a2qFuS1JHjk If anyone has any other videos that demonstrate this, please feel free to post them here.