GTA
Airguns by Make and Model => Gamo Airguns => Topic started by: Cliff H on October 10, 2017, 08:41:46 PM
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Just wondering how bad could it actually be to accidentally dry fire a Gamo ACCU when the sliding breech is in the open position. I have been shooting 25-30 shots everyday since acquiring the rifle back on the 30th of September. I have accidentally dry fired it with the sliding breech open probably 4-5 times. I'm shooting into a pellet trap at 20 feet in the garage, just trying to break the gun in a little. I get going kinda fast sometimes and thats when I forget to close the breech. And this is usually after working 12 hours in the Emergency Room where its usually crazy busy the entire time. So I'm not thinking to clearly. Anyway Im thinking that when the breach, and the transfer port is not aligned with the barrel, is still open the force of air is trapped thus cushioning the blow of the piston. The sound the gun makes when this happens is more of a muffled thud then a loud clang I guess I would say. Im just hoping I'm not really messing this rifle up. Im going to try to not let this happen anymore. Just curious what you all think.
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It is better not to do that. That puts a big load on the seal between the rotary breach and the transfer port. The worst that could happen is that the seal could distort but not likely. Maybe break a spring eventually. Both just maintenance jobs If it still shoots well no harm is done. You are not the first or the last person to do what you have done and it is not the last time you will do it.
Just keep shooting it.
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The possibilities range from absolutely no problem to shattering the spring, destroying the piston seal, destroying the breech seal, or damaging some internal mechanical parts.
At this point you may have "dodged the bullet". If you've caused yourself no problems thus far, lucky you. Damage can happen the first time, the tenth time, or it may never happen. It's a gamble all the way and the odds aren't in your favor.
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I've done it with my CFX, which is the same breech design. That spring didn't break until about 4500 rounds, so it probably wasn't my fault. I've also managed to fire it empty--sometimes the pellet slid out of the back of the barrel and onto the loading ramp just as I rolled it shut...that is technically more dangerous, but supposedly Gamo designed for it.
I would agree with your analysis. With the breech open, the piston is just thumping some air that can't go anywhere, thus no chance of hitting the wall, so to speak.
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I would not worry about it at all. GAMO tests examples of their new guns for dry firing before they hit the market. According to GAMO,2 production samples are each subjected to 50,000 dry fires...I had to read that more than once,too...and no failures. No other airgun mfr that I know of does that.
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I would not worry about it at all. GAMO tests examples of their new guns for dry firing before they hit the market. According to GAMO,2 production samples are each subjected to 50,000 dry fires...I had to read that more than once,too...and no failures. No other airgun mfr that I know of does that.
I had heard that too but never knew if it was true or not. If true, I'm glad to hear that because I own a Swarm and was not happy with the number of dry fires on JSBs given you have to be much more mindful to check if the pellet has seated or slid through the barrel on the auto feeding mechanism before the barrel is closed.
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It is better not to do that.
Im trying not to but for some reason it hasnt become habit yet!
The possibilities range from absolutely no problem to shattering the spring, destroying the piston seal, destroying the breech seal, or damaging some internal mechanical parts.
Yeah im aware of the possibilities. I was hoping the trapped air would keep the possibilities from happening. Lol
I've done it with my CFX, which is the same breech design. That spring didn't break until about 4500 rounds, so it probably wasn't my fault. I've also managed to fire it empty--sometimes the pellet slid out of the back of the barrel and onto the loading ramp just as I rolled it shut...that is technically more dangerous, but supposedly Gamo designed for it.
I would agree with your analysis. With the breech open, the piston is just thumping some air that can't go anywhere, thus no chance of hitting the wall, so to speak.
Ive had the looser pellets jump clean out on to the floor also. I would think leaving the breach open and accidently shooting would be less damaging then say shooting a empty chamber break barrel. Im sure its not good for the internals in some way, im definitely trying not to do it anymore regardless!
I would not worry about it at all. GAMO tests examples of their new guns for dry firing before they hit the market. According to GAMO,2 production samples are each subjected to 50,000 dry fires...I had to read that more than once,too...and no failures. No other airgun mfr that I know of does that.
Im not so much worried about it cause i can most likely fix anything that would happen. I was just more wanting opinions on what they thought about the trapped air cushioning the blow of the piston thus preventing catastrophic failure. I doubt this was the thought of the sliding breach design. I would bet the design was more geared towards safety of people getting there fingers chopped off. The 50,000 shot test rifles are interesting to know.
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I would not worry about it at all. GAMO tests examples of their new guns for dry firing before they hit the market. According to GAMO,2 production samples are each subjected to 50,000 dry fires...I had to read that more than once,too...and no failures. No other airgun mfr that I know of does that.
I had heard that too but never knew if it was true or not. If true, I'm glad to hear that because I own a Swarm and was not happy with the number of dry fires on JSBs given you have to be much more mindful to check if the pellet has seated or slid through the barrel on the auto feeding mechanism before the barrel is closed.
This is not somethingI just "heard about"...this info is found in GAMO's own literature.
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I accidentally dry fired my Accu with a closed breech when I first got it. No damage but I saw a photo on the net somewhere (?) of a CFX breech damaged from a few dry fires. The "damage" was an inprinted ring matching the outside diameter of the barrel at the face of the receiver. I would venture that a worn or compressed breech o'ring may cause the same type of damage over time.
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I accidentally dry fired my Accu with a closed breech when I first got it. No damage but I saw a photo on the net somewhere (?) of a CFX breech damaged from a few dry fires. The "damage" was an inprinted ring matching the outside diameter of the barrel at the face of the receiver. I would venture that a worn or compressed breech o'ring may cause the same type of damage over time.
This might be what you saw: https://www.airrifle.co.za/threads/43958-Gamo-CFX-Rotating-Breech (https://www.airrifle.co.za/threads/43958-Gamo-CFX-Rotating-Breech). So, it seems you can damage the front of the breech block. How many dry fires it takes is hard to say. Then again, I'm a surprised that air pressure can do that--the dynamics of a trapped mass of air don't seem conducive to transmitting enough force to stamp a metal block. Now, if the piston seal was already shot, I could see the piston making contact to really hammer that breech, open or closed, as just enough air would leak to allow the piston to make contact. Does that make sense to anyone?
If the gun still shoots ok, you haven't done anything really bad yet...
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Spring Damage and Breach/Block damage can occur, try to make sure you don't continue to do this.