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The Pro Comp v3 is a high performance upgrade kit for the serious paintball player that wants to compete with Mags & Cockers.  It includes a complete upper & lower bolt system.  The lower bolt weighs only 3.5 OZ, the stock bolt weighs 9 oz. The lower bolt, main spring and rear plug are integrated into one component.
 The O-ringless upper bolt is made of  low friction  Delrin. Its more reliable than a bolt with O-rings that can swell.  In the event of a ball chop a recess has been machined into the upper bolt to allow room for the shell so it won't jam the gun.  The Pro Comp v3 upper bolt has a precision .684 OD that dramatically increases efficiency nearly eliminating ball bobble in the feed port for improved ball feeding and eliminating the need for a power feed.  You can actually fire the gun with the feed adapter full of balls (hopper off) and the balls won't fly out, try that with your VM68. The stock bolt has a .670 -.675 OD allowing alot more leakage into the feed port causing ball bobble in the feed port which causes ball chops and inefficiency.   The face of our upper bolt has a special cupped  seat to cradle the ball, and is designed with a internal expansion area that allows the CO2 expand before it hits the ball which gives the ball a push with a cushion of air for less ball  distortion for better accuracy and less in gun ball breakage,  instead of a sharp jab like the stock bolt or a venturi bolt does. Our upper bolt also has a tournament legal rear external non click velocity adjuster so you can precisely set your velocity where ever you like, no more down the barrel adjustments. The gun is cocked from the back of the gun, the cocking knob is locked in place and does not move when gun is shooting.  The upper bolt, velocity adjuster and cocking knob are also integrated into one component.
Since the gun is now cocked from the back the sides of the gun are completely sealed with two black anodized aluminum covers that are form fitted to the gun and have
vm68 Pro Comp v3 lazer engraved on them, they are held in place permanently with a special very high bond double sided epoxy tape making the gun quieter and keeping dirt out, and they look awesome!.
 With the Pro Comp v3 light weight, low friction  internal upgrade, the cyclic rate of fire is greatly increased with almost zero felt recoil, making the gun super smooth and very accurate under rapid fire conditions. The timing of the upper and lower bolts have been drastically altered allowing the gun to only need approximately 250psi to operate with out going full auto. Note test specs below. (A stock VM68 needs aprox. 650psi to operate properly).
The kit includes a trigger upgrade that shortens trigger pull by aprox. half of the stock trigger.
Extensive tournament level testing has allowed us to bring all these proven benefits into one kit that  will make you think your shooting a different gun!

NOTE: This kit does require some minor  receiver and trigger preparation.
1) Installing the Pro Comp v3 kit will lighten the VM68 by almost a half pound, making a stock VM68 w/o a barrel go from 3 lbs 5 oz down to 2 lbs 14 oz.
2) No screws to field strip the gun, just one quick strip pin and the upper and lower bolts slide out, no spring to wrestle with, just two parts to clean, and you can field strip and reassemble in less than 30 seconds.
3) Less primary sear wear or breakage because of the lighter upper and lower bolts.
4) Excellent cold weather operation because of lower operating pressures.
5) External velocity adjustment that can be precisely set with a standard 3/16 in. hex wrench. (Allen wrench)
6) Much faster cyclic rate of fire.
7) Sealed sides make gun quiet and keeps dirt out.
8) Simplicity, reliability and consistency, we've retained the VM68 dependability.
9) Increased shot to shot velocity consistency and drastically reduced gun recoil produce a marked increase in accuracy, especially under rapid fire.
10) Greater air efficiency.
11) Upper bolt design dramatically reduces ball breaks in the gun and increases accuracy.
12) Shorter  trigger pull increases rate of fire.

     Pressure verses velocity test. (Note: Do to so many variables with each gun, ambient temperatures, different barrels, brands of paintballs ect. results may vary.)  The test was performed using CO2 with a regulator to adjust pressure. Ambient temp was approximately 55 degrees F.  The gun tested used a stock valve set at the 12 o'clock position.
                         PSI                    FPS 
                         250                    205
                         350                    245
                         450                    270
                         525                    295
 The kit price is $149.50 plus $25 installation.    Includes pneumatic oil and maintenance manual. Keep in mind that this a very serious upgrade for the very serious player who really wants to compete with Mags and Cockers.  This is a true tournament level upgrade.