The Vang Comp System for Shotguns
John Maniatty

The following are pics of how my shotguns patterned before and after I had Mr. Vang modify them. They both feel so much smoother shooting them without any trigger work. The patterning pics speak for themselves but what they will not tell you is what a pleasure it was doing business with Mr Vang.

About The Vang Comp System from Hans J. Vang's website:

Quote:
The Vang Comp System
Modifications to Shotgun Barrels

The Vang Comp System (VCS), designed by gunsmith Hans J. Vang, is a set of modifications to shotgun barrels. The alterations to the barrel consist of lengthening the forcing cone, back-boring the barrel, and adding compensating ports. With the VCS, accuracy significantly improves, felt recoil is dramatically reduced, and muzzle rise diminishes. By lengthening the forcing cone, the pellets have a smooth flow from the chamber to the bore. This prevents the pellets from bunching up in the barrel and reduces the felt recoil. In addition, the pellets do not become as deformed and keep a more consistent shape.

Higher Rate of Accuracy

With less deformation and a less turbulent flow, the pellets achieve a higher rate of accuracy. Back-boring the barrel is accomplished by boring the barrel from the chamber towards the muzzle creating a choke where there was none. Back-boring is a key portion of the VCS modification and aids in both increasing accuracy and reducing felt recoil.

Compensating Ports

Probably one of the most important and most obvious parts of the VCS are the compensating ports. Some of the gases, created by the burnt powder exiting the muzzle, vent upward through the ports. This redirected gas flow helps prevent the muzzle from rising and allows for both increased accuracy and a more rapid recovery time between shots. Also, the ports reduce muzzle flash, which in turn helps to retain night vision and keep the shooters location less conspicuous in low light conditions.

Reduce Felt Recoil By About 15%

In combination, the lengthened forcing cone, the back-boring, and the compensating ports make up the Vang Comp System. The VCS has been estimated to reduce felt recoil by about 15%. The increase in accuracy is dramatic. For example, patterns using 9 pellet 00 buck are as tight as 2 3/4" at 15 yards and 10 to 12" at 25 yards. Also of note, all modifications, except the compensating ports, are internal.

Maximize Performance

No extra parts are added to the barrel. Thus, the VCS barrel requires no maintenance other than normal cleaning. Also, other types of specialty ammunition, such as slugs, can be used in the Vang Comp System. The VCS, developed to maximize performance of the tactical shotgun for Law Enforcement and Military applications, is covered by three U.S. Patents. Currently only Mr. Vang's Arizona facility produces the VCS.

Ammo:
Federal Tactical Buckshot (LE132 00)
12 GA - 2 3/4"
00 Buck - 9 Pellets

Remington Police Magnum—before modification
Remington 12 ga. 3" 870 Magnum with a 18" barrel (Secret Service model made by Wilson Combat)
Adjustable TRAK-LOCK® Ghost Ring rear sight, ramp type front sight with tritium self luminous insert
Capacity: 9 round
Speed Stock: 4 Rounds
Multi-Purpose Tactical Sling
Vang Comp Safety

Remington Police Magnum—after VCS modification

Wilson Combat TR-870—before modification
Remington 12 ga. 3" 870 Magnum with a 14" barrel (cylinder bore)
Adjustable TRAK-LOCK® Ghost Ring rear sight, ramp type front sight with tritium self luminous insert
Capacity: 6 rounds
Side Saddle Shell Carrier: 6 rounds
Short Butt Stock and Surefire Tactical For Grip with 11,000 candlepower light
Multi-Purpose Tactical Sling
Vang Comp Safety

Wilson Combat TR-870—after VCS modification

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