GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: Matchstickshooter on May 19, 2020, 04:13:15 PM
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Has anyone here done the Detent Mod posted on YT, and what were your results? (Detent Mod...O ring on the detent and a little stronger spring)
Thanks
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Should start a new post, but will try here as the originator appears to be somewhat expert on the Crosman 1077 CO2 repeater rifle. If I can get the subject below fixed I can give some comment on the "O Ring" modification.
I've had my 1077 apart and reassembled many times trying to get it back into shooting. No leaks to speak of, just little or now power, except maybe in one of my posts I thought it was shooting much better.
Here's the specific area I'm about to re-explore, i.e., reopen the gun to try.
Detent Body and Detent, they are Keyed, suggesting there is one correct location for the detent body on the valve body... it can be installed in any of the 360 degrees of possible rotation without any correct mark provided. I had after the mistake of disassembly when I looked on Youtube and saw advice to mark the valve detent body with a painted line so that it is reassembled correctly on the valve body. I didn't.
On the Detent, it is round and has four bevels on the end where the detent interfaces with the pellet magazine. The Valve body has a flat shouldered edge to assure it is placed in the gun body in the correct position. So, I figured, I'd install the keyed Detent such that the largest bevel faced downward to help it be pushed back (there is a spring behind the detent) when the pellet magazine is inserted. Yes, the barrel can be moved forward to give more room, but there seems to be no need to move the barrel unless a pellet becomes stuck.
This didn't work, pellets hardly made it out of the barrel.
Now think the bevel needs go be rotated 90 degrees so that it faced the pellet magazine rotation, i.e., when the trigger rotates the magazine to move the pellet into position to fire, it will have the bevel on the detent to help it smoothly move into correct firing positon.
Welcome any advice. The gun isn't hard to disassemble, but I'll postpone my next experiment disassembly to see if I get any responses.
I like the 1077 for light plinking and if I weren't living in the NJ anti-gun state I'd likely just buy an new 1077 for well under $100. I have some interest in the Benjamin Wildfire PCP which is built on the 1077 design. I have 7 magazines for the 1077 which will work in the Benjamin Wildfire. Think the Wildfire can be had for about $150 so also rather inexpensive, albeit I'd have to buy the pump, but not CO2 cartridges. It is possible to buy guns in NJ, at least at this point in time, but none of the gun shops I know sell pellet guns or seem interested in doing special orders.
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Jerry is looking for answers which have me stumped. Too long ago for me.
Please someone chime in!
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Jerry,
I have two 1077's - a good one (wood) and a beater (plastic). I've taken the plastic one apart several times. I will try to take care of getting you some pictures tonight.
I'm an ex-NJ guy myself, having spent pretty much all my first 45 years in the Phillipsburg area. IL is only 1 very small step above NJ when it comes to freedom.
Andy
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See if these help you any. If not, show me what I should be detailing for you.
Andy
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Wow!!! Great, just what I needed. I had, as stated in my post, decided to reinstall the detent so that the largest "bevel' is facing "out", i.e., toward the direction the pellet magazine rotates. I had installed it so that that bevel faces downward to help assist the insertion of the magazine into the gun. Of course, one can also push the barrel forward to gain room, not that it is needed. The moveable barrel is intended to open up to remove the magazine when a pellet gets jammed between the magazine and the barrel, as can happen when one tries to force too many shots out of the CO2 cartridge. I had gotten at least 3x12= 36 shots, and would try to run a forth magazine before the shot power was too weak to shoot even 30'.
You first photo was just what I needed. I can clearly see there that the bevel faces as described.
I had installed an "O" ring and a slightly stronger spring (Mods recommended elsewhere) and got lost in positioning the detent correctly. I have the full parts breakdown which shows the detent but not in enough detail to show it's angular position. Don't understand what the yellow/orange is on the back of the rear of the CO2 chamber.
I'll post my result, with the detent mounted as shown in your picture.
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The orange is wire that I used for an experiment in heating the barrel, valve, and cartridge to improve performance.
Glad it helped.
Andy
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Reply: to bring more detail on my "fix" for my Crosman 1077 CO2 repeater 0.177 AND to share my ongoing learning. Hope I am learning.
Thanks Andy, very helpful pictures, but..
On reassembly I managed to jamb several pellets in barrel. These I could not force through with a cleaning rod, so after some checking on Youtube I decided I'd try melting the pellets out of barrel, takes about 650 degrees Fahrenheit to melt lead, a lot more than that to melt a steel barrel. I removed barrel, easy to do, and melted the lead pellets out. Of course there's some "tinning" left inside by the melting lead, making the barrel smaller. I forced a number of pellets though the gun to lean some to the lead tinning. The pellets go though much more easily after this action, which may have damaged the riffling.
So, back to detent issue:
Humm..tried to insert picture of detent in detent body to show the unusual set of bevels on the detent end facing the pellet magazine. These two items have a fixed alignment, keyed detent to body. The body itself has two shoulders that fix its alignment relative to the receiver body and thus magazine. The valve body connects to the detent body with an unrestricted angular position, no key. It, the body, must be rotated so that the CO2 transfer tube connects in such a way to not restrict reassembly of the receiver body. Marking that alignment with paint before disassembly will make assembly easier, rotating the detent body on the valve takes some force.
On attachment of picture, I know not what I have forgotten. I picked a file from my computer and put it in the forum "Attachment" option. It may appear when I post, but if not I tired to explain sufficiently with just words. Picture doesn't show when I do a "Preview" making it unlikely the picture will be attached.