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Popular mods for field target discos

Forums PCP Airguns PCP Airgun – Discussion Popular mods for field target discos

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    Raden1942
    Participant
    Member
    United States
    Accuracy: +27

    So I jumped into pcp airguns after tons of research and it still wasn’t enough to save me an expensive mistake. I did the classic hand pump with two rifles being primarily used for hunting. I made sure i got the best deals on said items. Then i realized I don’t like pumping. So i got a firemans scba. See where im going with this? I finally got a ninja 90ci 4500 bottle and 3000 output reg. Nice i can hunt. Well now i want to shoot all the time and a disco 177 is the answer as my local club does field target. So i want a disco modded for supreem accuracy. Shot count does not matter as i could care less if i got ten shots as long as a 2000 psi is fill limit. I know of the huma reg and how to polish parts with a dremel. Is there any other hidden costs im forgetting? This is getting a bit rediculous.

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    shutik
    Participant
    Member
    United States
    Accuracy: +10

    Will you be starting in Hunter division? You will need a scope that can range well and has reticle for hold over points.

    I’ve started with maximum, added regulator, accuracy was great from sticks, but standing was challenge. You most likely will need better fit stock to address balance and fit. You will also need better trigger, because that means better accuracy.

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    Raden1942
    Participant
    Member
    United States
    Accuracy: +27

    Forget to mention I spent a long time researching scopes too and luckily after watching 100’s of review videos  made from companies with an intrest in the product I came across cyclops videos from youtube. “Spoiler alert hes the guy with the eye patch” anyway he pointed me toward an aztec emerald 6x24x50 paralax adjustable with side wheel. I couldn’t be happier. Sorry my posts are long but i honestly think folks have to hear this stuff. When you see a review that is well put together visually and lists off all the stuff market people want to hear dont do it without checking first. A good technique i did was to look up popular airgun mods for each model. Also dont trust a video where someone says this is the best gun ever and nothing could be better on it. ? maybe that person sells this gun and has nothing but good things to say even tho its a china toy. Anyway I have the scope fill system bags tables hoses and everything else but i plan on just getting a disco polishing it up and slapping a reg into it. Am i missing anything else. 

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    shutik
    Participant
    Member
    United States
    Accuracy: +10

    I have Aztec scope too and love it, good choice!
    I’ve mentioned that you would want to get another stock (boyds) and marauder trigger group, but you don’t have to at the start. Start shooting matches and you will see.

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    spysir
    Participant
    Member
    United States
    Accuracy: +81

    Do not over look making the rifle fit you. Cut/chop/hack/bondo, custom carve a stock/other.

    Esp. it FT it needs to fit.

    You have already been to myour local FT club where folks have scopes you can look through , maybe purchase … right?

    John

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    c_m_shooter
    Participant
    Member
    United States
    Accuracy: +13

    A regulator won’t do any good unless you modify the valve screws for increased fill pressure. Order a transfer port from crosman CH2009‐026 and spare seal 130‐036.  This is the transfer port for a challenger, the opening will measure about .050.  Drill it out to about .08″ and install it in your rifle.  After that you can install a commercially available power adjuster to tune or start clipping you hammer spring one coil at a time and shooting shot strings over a chrony until you get a good usable bell curve. Your stock transfer port is .125 and too big for the power you need.  I had a regulator in my rifle and had it tuned for 12 ft lbs with a shot count of over 60 with 2500 fill. Then the reg went out and I threw it in the back of the closet and went to shooting springers instead.  At 17 or 18 ft lbs you should be able to get 40 shots or so. There is a brass trigger kit available that will lighten the pull quite a bit.

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    Wadcutter
    Participant
    Member
    United States
    Accuracy: +15

    Another option to help accuracy and shot count is to make or purchase an SSG for your disco. I won’t post any links to other forums, but if you do a google search ” Benjamin Discovery SSG ” you can study up on the subject.

    I made one for my sons .22 cal. disco and the results were fantastic.

    Here is a 20 shot string when purchased new. This is with the recommended 2000psi fill. No modifications to rifle. It was pretty sad.

    1 Benjamin Discovery 20 shots all stock

    Below is a 30 shot string after adding an RVA (power adjuster) from Ebay. 2100psi fill. Better, but not great.

    2 Benjamin Discovery, RVA, 2100psi, Stock Spring 2.04in., 30 shots

    Fashioned an SSG using the RVA I bought off Ebay and a spring from Menards. Filled to 1900psi. A 40 shot string resulted in over 18fpe and a 20ES. Effeciency looks pretty good also. 

    3 Benjamin Discovery, SSG, 1900psi,  Spring 88265, half turn out off  hammer, 40 shots

    If filled to 2050psi a decent string of 50 shots was achieved. Effeciency dropped a bit and the ES jumped to 42. 

    4 Benjamin Discovery, SSG, 2100psi,  Spring 88265, half turn out off  hammer, 50 shots

    On a 2200psi fill(which is max I will go with the factory valve screws) the rifle eked out 60 shots at 18.23 fpe with ES of 58. 

    5 Benjamin Discovery, SSG, 2200psi,  Spring 88265, half turn out off  hammer, 60 shots

    Total cost of the SSG mod is less than 20.00USD
    Another benefit is the rifle is much quieter.

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    c_m_shooter
    Participant
    Member
    United States
    Accuracy: +13

    You will also need a plan to deal with the wandering point of impact.  If you use double barrel bands, the poi will change with the pressure in the tank.  If you free float it, the thin Crosman barrel will be pointing a new direction every time you take it out of the case.

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