DD68 Redux

Aesthetics

The Redux design is based on David Loo's DD68 Desert Duck which was designed to look like a Colt M1911 pistol. Placing the compressed gas source, the 12-gram powerlet, inside the grip avoids the need for an external "bucket changer," contributing to pistol-like appearance.

An extended front grip is available which adds approximately 1-inch to the height of the pump handle. The extended grip is attached via four (4) machine screws. The standard pump handle which surrounds the barrel is left intact and the extended grip simply bolts on.

Internal valve mechanism

The term Nelson-based is borrowed from the Nelson Paint Company and its first marker, the Nel-Spot 007. The basic valve design found in these early markers laid the groundwork for many other manufacturers, including CCI, to develop their own paintball guns.

The Nelson design is in-line which means that the bolt, hammer, and valve follow the barrel and form a line as opposed to being stacked.

The Redux fires from a closed bolt position meaning that when it fires the bolt is secured into the breech end of the barrel with a paintball loaded. In comparison, the bolt in an open bolt marker is not secured until the marker fires, at which point the paintball is chambered, fired, and the bolt is then re-opened.

There is no evidence showing that either design is more or less efficient than the other in the sport of paintball.

Another characteristic of the Redux that varies within the Nelson-based family of markers is that it features the original breech drop design as opposed to the bore drop variation of the design, meaning that the paintballs drop into breech, aft of the barrel, rather than dropping into the bore of the barrel. Breech drop markers.

Hammer and bolt

According to Steve Brett, aka "mOngo", the Redux uses a slightly modified CCI Phantom bolt.

In the Redux, the bolt has an extra hole drilled on the side to accommodate the field-strip lever placement, slightly rearward from the standard Phantom bolt cocking arm hole. The hole for the Phantom cocking arm bolt remains and care must be taken to line up the correct hole with the Redux field-strip lever pin, otherwise the marker will not cock correctly.

This is done for cosmetic reasons, so the field-strip lever location matches that of the original Dave Loo Duck.

The bolt is further modified by having the front taper lengthened slightly. This is done to match the taper at the front perimeter of the breech, behind the lip which retains the Freak insert.

Power tube / Valve tube

The terms power tube and valve tube are used interchangeably to describe the same part. The Redux comes standard with a Lapco #4 power tube which has been bored to the same size as a Lapco #6 power tube and cut shorter so that it doesn't interfere with the Tune-Port-Compensator(TPC) portion of the bolt.

Barrel

The standard Redux barrel is screwed into the "snub" and is bored to accept Freak inserts. The Freak insert protrudes from the rear of the barrel by 1.25 inches and, measured from the rear of the insert to barrel tip, is 6.25 inches long.

Sights

The Redux slide is milled to accept standard 3/8" dovetail-mount rear sights like the 1911 Colt firearm it resembles. The front sight is a simple blade-style which is pressed into a machined pocket in the Redux slide and is removable for upgrading.

Tools

The Redux does not ship with a user manual but, being based on the Nelson design, is quite simple. Tools needed to service all external screws are:

NOTE: this is an incomplete list; please consider adding to it if you have access to a Redux

Hardware & parts

All hardware is stainless steel.

General Assembly Bolts

Trigger group

O-Rings

Two o-ring sizes are used in the Redux, one to seal the bolt-head against the barrel/breech, the other to seal the valve seat.

Springs

Hammer & valve spring set is a standard Nelson variety. Large springs are for the hammer, small for valve and stiffness/colour relationship is the same for both.

In some sets, green/blue stiffness is reversed.

Valve seal

The valve seal is made of stainless steel, similar to that of a standard CCI Phantom but with some changes. Instead of wrench flats on all sides, the Redux valve seal has only two wrench flats. These flats rest against a "lip" which prevents the wrench from contacting the face of the valve, in order to prevent tool marks. The wrench flats require an 11/16" open-ended wrench or an adjustable wrench set to that size.

NOTE: this is an incomplete list; please consider adding to it if you have access to a Redux

Operation

Compressed gas enters the valve of the Redux via a port on the underside of the valve body, angled downward and to the rear, where a 12-gram CO2 cartridge protrudes from the grip-frame.

The cup seal assembly is pressed against the retainer with the aide of the valve spring.

This gas forces the valve to stay sealed and allows the gun to be cocked which prepares the hammer of the paintball marker for firing. Without the pressure of the gas in the valve the gun cannot be cocked.

As indicated by the term pump action the first step in firing the marker is the pump stroke. The link pin connects the pump handle and bolt.

The loading and firing sequence consists of several stages, assuming the marker is gassed up and has been appropriately tuned: