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I’m not trying to argue against the piston guns, but manufacturing costs, weight and barrel heat are all factors that inspired me to go a different way.”
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“So, with the piston guns, the barrel heats up more than a direct gas impingement system. Piston-driven guns keep more heat in the piston and the barrel it doesn’t allow for the bolt carrier to work as a heat sink,” said Zitta. “They (piston guns) cost more to make and you still need to clean the piston. Piston-driven ARs have become a very hot item in recent years and I asked Zitta if the DIGS gas system had any advantages over the piston-drive guns. The bolt can be disassembled from the bolt carrier in the same manner as any M-16 or AR-15 bolt carrier assembly. This is as far as the weapon needs to be disassembled for routine cleaning. The bolt carrier and operating rod will come out with the charging handle. Grasp the charging handle and remove it from the rear of the receiver. Push out the takedown pin at the rear of the lower receiver, allowing the weapon to hinge open at the front take-down pin. Next, pull back the action spring and remove the spring retaining clip and ease the spring forward. To access the DIGS system one first removes the top rail by depressing a spring-loaded plunger and then sliding the rail forward and off the handguard. The top rail is perfectly indexed with the receiver’s Picatinny rail top and gives one the option of mounting an optic or red dot far forward of the receiver. I don’t always use a vertical foregrip and this design is comfortable to shoot without one but still leaves that option available to the shooter. Para USA outfits the Tactical Target Rifle with an aluminum free-floated handguard that possesses a rail system on its forward end. Because the bolt carrier is shorter by 2.90 inches, the forward assist is also moved forward and Para USA wisely incorporated the brass deflector into the assist. There’s no need for it, since this system does not use a buffer spring: Remember, the new Para USA rifle uses an action spring wrapped around the Op Rod. The familiar M-16/AR-15 bolt is used on the Tactical Target Rifle and it locks up into the steel barrel extension, but the rear of the bolt carrier is removed. Of course, you always want to clean the chamber, regardless of whatever system you use.” The Op Rod and the gas tube on the Tactical Target Rifle system intercourses itself and the wiping action of the stroke and pressure self-clean. It is plated with electroless nickel and the gas tube is chrome plated. “What I call the Op Rod is actually an extended gas key that is hollow. Zitta reports there’s no need to clean the Op Rod area of the system. Excess gas is vented through ports on the right side of the bolt carrier that blow it out through the ejection port. Because the gas tube does not enter the upper receiver, gas residue is not introduced into the receiver area.
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Once deployed, the stock can be adjusted 3 inches in length.Īnother advantage of the DIGS gas system is that the gun runs cleaner. Renamed by Para USA as the Rapid Deployment Stock (RDS), it is designed to fold to the left side of the gun so that the stock could be deployed while a right-handed person held the gun with a firing grip. With the stock folded the overall length of the weapon is a surprisingly compact 26.5 inches. Note that I said, “folding,” not collapsing.
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One of its big advantages is that it allows the use of a folding stock. Para USA has trademarked the name “Delayed Impinged Gas System” (DIGS) to describe this operating system. An action spring is wrapped around the op rod and this spring replaces the conventional buffer tube spring. Zitta’s design uses a specially modified gas key, which is called the Op Rod in Para USA nomenclature that extends for 10.5 inches through the upper receiver, over the barrel down to the gas block where it slips over the gas tube. I’d been aware of Zitta’s operating system for years but had always thought that it was a gas-piston system. It’s a sharp-looking carbine that possesses a number of features that deserve a close look. Licensing the gas system from Allan Zitta of ZM Weaponry, the rifle features Zitta’s trademark slider/folder stock, a free-floating handguard rail system and Yankee Hill detachable sights. One of the big surprises this year was that Para USA, the manufacturer best known for their high-capacity 1911 pistols, introduced an AR-15-style rifle.