The SIRIS suppressor is made of the best quality materials that are ideally suited to their purpose, and is assembled with great care. The SIRIS allows you to shoot high-powered .22 LR ammunition with a report similar to that of a BB gun. The barrel is ported to bring the velocity of even the hottest .22 LR round down to subsonic. The ports are arranged to minimize fouling in the expansion chamber area and to allow crud that does get in there to come back out. The host Ruger pistol retains its full 6" length barrel, and accuracy is unaffected by the addition of the suppressor. Some of our customers say that the accuracy of the SIRIS is actually better than the stock gun, but since we don't have scientific proof to back that up, we won't make that claim. The rear drift-adjustable factory sight is retained, while a custom made low profile front sight is bonded to the suppressor tube. If your gun has a parkerized finish, then your SIRIS was built on a Ruger model MK6 or MK4 pistol, and has a 4130 chrome moly tube. If your SIRIS is stainless then it was built on a Ruger model KMK6 or KMK4 pistol and has a 304 stainless steel tube. The suppressor tube is threaded to the receiver and held in place with a large amount of torque and with thread sealant. The seam between the receiver and tube is blended in and is, in most cases, invisible. In both the parkerized and stainless versions the suppressor internals are the same; strain-hardened 304 stainless steel baffles separated by aluminum spacers. The expansion chamber cap (inside the suppressor, made of 303 stainless steel) is threaded onto the end of the barrel and requires a special tool to remove. The suppressor end cap is made of 303 stainless steel or 1018 steel on the stainless and parkerized versions, respectively. This cap is threaded and may be removed by using a lathe collet. It is not meant for frequent assembly and disassembly, as access to the baffle stack is not required by the user. The expansion chamber end cap may also be removed (with the special tool), but this also is not required of the user. The end cap, expansion chamber cap and suppressor tube are removable for three reasons: First, threaded joints are very strong, don't kill the temper of heat-treated parts like welding does, and make assembly line-type production of the SIRIS possible. Second, on the parkerized guns the tube is kept open while the barrel and ports are plugged during the parkerizing process. This allows the chemicals to go where they should, and not where they shouldn't.  And, of course, if welding were part of the reassembly step after parkerizing, the finish would be ruined. Third, in the unlikely event that there should ever be a need to repair or rebuild a SIRIS, it's much easier to take apart a threaded assembly than a welded assembly. There are lots of suppressed Ruger MKII pistols on the market, but few are built as well as the SIRIS. If you want a suppressed .22 that combines excellent sound reduction, excellent quality, low price, all in a great looking package, look no further.  Price of the SIRIS is $775 for matte stainless (shown above), and parkerized (below).

MAINTENANCE: The SIRIS is essentially maintenance free, with no internal parts which are susceptible to wear or clogging. With the pistol taken down and the upper receiver removed, any crud that has accumulated in the expansion chamber may be removed by shaking with the muzzle pointed up. Immersion in a solvent is unnecessary, though generally won't do any harm. BUT, make sure that the solvent is compatible with aluminum (Hoppes #9 is NOT), since the spacers are made of it. A dry bronze bore brush run through the barrel will keep carbon from building up in the ported area. A light coating of oil on the gun will enhance its corrosion resistance and improve appearance. Follow Ruger's recommendations on maintenance of the pistol.

AMMUNITION:  The SIRIS works well with a variety of .22 LR ammo, CCI Mini Mags being a favorite.  The barrel porting brings the velocity of the Mini Mags down to 1050 fps, which is as close to supersonic as you want to get.  Remington Target ammo is also a good choice, and is noticeably quieter than the Mini Mags. Subsonic ammo is not required, and generally doesn't reduce the sound level below what is achievable with standard target ammo. For the utmost in quiet, try CB Long ammo.  It won't cycle the action, but is so quiet that it's almost beyond belief.  It only goes about 550 fps, so keep this in mind.  Basically, try whatever ammo you can buy the cheapest.  If it cycles the action and is quiet, stick with it!

LEVEL OF SUPPRESSION:  In the yet-to-be-published data from the Knob Creek Suppressor Trials of 1999, the SIRIS was measured at 118db, using Remington high velocity ammo. So it's very quiet. Still, if you're really worried about having the quietest integrally suppressed .22 pistol, "test drive" several guns first, then make your choice.  Don't just go by the numbers; let your ears decide.

WANT TO HEAR THE SIRIS FIRING?  CLICK ON THE PICTURE...