Falcon 10-22 Integral Suppressor
This integral 10-22 is called " FALCON" and comes standard built on a
Ruger heavy barrel varmint 10-22, weaver base, and recoil buffer to help
quiet the action noise. This design in non-ported therefore requiring the
use of subsonic ammo to maximize the sound reduction benefits.  Normal
high velocity ammo is fine, it simply will have a sonic crack downrange.  
This rifle is intended to follow the factory target barrel contour so that any
aftermarket accessory that would fit a unmodified rifle will still fit our
suppressed model, This means you can change stocks, trigger groups,
receivers, optics, or anything else and still have a very nice stealthy
package.
We have found  that the following ammunition does not like being fired in a Falcon with the following modifications:

Ammo - Remington Bulk Pak "Golden" bullets. They appear to be copper plated. Plain lead bullets work fine, just the plated ones
were giving problems.

The mods on the rifle were:
Bolt has been ramped to facilitate feeding of lower powered ammo (most likely the culprit)
Trigger reworked to 2 1/2 pounds.
Bolt Jeweled

Be careful with this ammo as  I fear it is not loaded consistently.
This rifle comes complete with recoil buffer and scope base rail for 725$