If you have a conventional muzzle wood gun and would like to upgrade it by adding lots of power and accuracy without the harsh recoil, then this kit is for you.
This kit will make it easy to convert any wooden barrel into a powerful blue water gun. The concept derives from the Mannysub double roller bolt on kit design used for rail guns, proven to be very accurate, powerful and easy to load.
The simple and effective Mannysub inline offset design allows you to drastically reduce the dimensions of the muzzle width, compared to side by side, or partly offset double roller designs. This system is very low profile, thereby drastically improving lateral maneuverability.
With twin 14mm small id reactive rubbers, it will launch an 8mm shaft at exceptionally high velocity. With twin 15mm or 16mm small id reactive bands, it will drive an 8.5mm shaft at very high speed on spearguns ranging from 100 to 120cm. A 7.5mm spear shaft can also be used with reduced pre tension and 14mm bands.
Full ceramic bearings (8 in total/2 per wheel). This upgrade will make it easier to load, while adding extra power, smoothness, and reliability. 
One of the cool new features, is the use of carbon fiber bridge versus a metal bridge. The smooth outside edges of carbon fiber enable the wishbones to last much longer and add a touch of class and contrast to the wood.
 
LARGE CARBON FIBER BRIDGE:  165mm long x 22mm OD x 16mm id x 3mm thick. Suitable for shafts between 8mm(5/16) to 8.7mm(11/32) with mini shark fins.

Bearing Rod: 65mm long, will leave 26.5mm for the middle section of the barrel.

The kit includes:
4 acetal roller wheels with 2 ceramic bearings (2 per wheel), 2 acetal bushings, with mounting screws used as an anchor point underneath the barrel for quickly connecting /disconnecting the rubbers.
Two stainless steel- 65mm long x 6mm OD rods, and a 4mm front mounting bolt for the rollers. 
(1) carbon fiber bridge to make the muzzle
(1) 2mm U pin used to guide the  reel line and accommodate a second wrap of shooting line
(2) 2mm CNC cut XL carbon fiber plates, with screws to secure and protect the outside of the rollers on each side of the wooden barrel.
A dyneema pack for making the rubber inserts and wishbones (2mm white dyneema), 2.5mm red dyneema for making the loop loaders,  and grey 1.4mm constrictor cord for making the constrictor knots on the rubbers.
This kit does not come with rubber or installation instructions. (Black wheels only)