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Posted: 4/3/2015 7:43:29 AM EDT
| So I just got my sparrow from my dealer and went to the range yesterday. I was shooting rem target thru my FVSR. I was using a crush washer to spacer out the supp. The thing was I fired 115 rds and maybe 30 of those were pellet gun quiet. Is that normal? |
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Quoted: Sounds like you had rounds going supersonic. When they break the sound barrier it's almost like you aren't using a suppressor on a 22 LR. I had my first experience with this this past weekend. Really an interesting phenomenon. Trigger pulled and there was no noise at the rifle. Split second later there is the loud crack down range. It took me a few seconds to realize it was my rifle as it sounded like somebody else had fired midway down the range.. Although the crack was disappointingly loud I was impressed at practically no noise at the muzzle. This illustrates the benefits in a military role. The supersonic crack will not be masked but identifying the location/origin of the shot will prove very difficult. I'm looking forward to running some subs through it to see how quiet I can get. |
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Quoted:
I was at an outdoor range surrounded by brick. It is 1150 fps for the ammo. I was just trying to burn up before I use my cci quiets... Sounds like we found your problem... I bet you had a mix of of subsonic and supersonic shots since your ammo is hovering right near the sound barrier. -Mike |
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Quoted:
So I just got my sparrow from my dealer and went to the range yesterday. I was shooting rem target thru my FVSR. I was using a crush washer to spacer out the supp. The thing was I fired 115 rds and maybe 30 of those were pellet gun quiet. Is that normal? Was the crush washer needed? I have an FVSR that I use to mount a Spectre II and the threads engage the o-ring in the can almost perfectly. |
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Quoted:
Was the crush washer needed? I have an FVSR that I use to mount a Spectre II and the threads engage the o-ring in the can almost perfectly. Quoted:
Quoted:
So I just got my sparrow from my dealer and went to the range yesterday. I was shooting rem target thru my FVSR. I was using a crush washer to spacer out the supp. The thing was I fired 115 rds and maybe 30 of those were pellet gun quiet. Is that normal? Was the crush washer needed? I have an FVSR that I use to mount a Spectre II and the threads engage the o-ring in the can almost perfectly. I haven't measured but it will bottom out befor snugging up to the shoulder |
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If you want to risk damaging your suppressor from misalignment (NOT a warranty issue), by all means use a crush washer as a spacer. The sides are rarely parallel, and lack thereof will cause misalignment.. If you are needing to shorten up the threads on the rifle to the recommended 0.400 inch, there are a number of vendors that sell spacers specifically for that purpose. We at Gemtech offer one that threads on so you won't lose it. Or in 3 minutes on a lathe, one can be custom made.
Please don't risk an investment you have made by using a spacer that all manufacturers and most users have said is bad news and will void warranties. On the other part of the question, speed of sound varies between 1060 and 1160 fps, depending on temperature (0 to 100 F). The ballistic crack (sonic boom) of the .22LR HV bullet is 142 dB measured 1 meter to the side of the flight path 50 meters down range. A non-suppressed Ruger 10/22 is 140 dB 1 meter left of the muzzle. Most suppressors will reduce the 10/22 muzzle blast to the 115-120 dB level, which is air gun quiet. First round pop in .22LR is usually 3-8 dB louder than the remaining rounds and this is due to a secondary burn (or detonation) of powder particles in the entrance chamber. This is seen primarily in suppressed pistols, because the barrel length is not adequate for a complete powder burn. It is rarely seen in the .22 rifle. After the first round, there is no more oxygen present to sustain this burn/detonation. The monocore designs tend to have a greater first round pop than do the more traditional M- or K-baffles on a pistol, but on a rifle there is usually no first round pop. Monocores are a lot easier to clean. |
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