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Fac Impact Service

Discussion in 'Firearms Certificate (FAC) Guns' started by MikaMutt, Nov 24, 2019.

  1. MikaMutt

    MikaMutt Engaging Member

    Messages:
    198
    Likes Received:
    196
    Location:
    Harwich
    I’ve taken the bull by the horns and completely disassembled my .25 Impact for a proper going over before the installation of a power kit.
    So a thorough internal and forensic clean, polish bits that need polishing and new O rings.

    A couple of things discovered, internally the gun is filthy! The hammer is buggered, with tiny dings around the edge, according to Ernest Rowe’s instructional videos, this is caused by letting the cocking lever fly back when the gun is either cocked or half cocked causing the hammer to strike the cocking pin, and requires replacement. Used guns eh? :rolleyes:

    Very nicely engineered though, I’m mightily impressed and can now see where the cost is.
     
  2. the logun-ator

    the logun-ator "can i,? wey aye man!"

    Messages:
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    Likes Received:
    345
    Location:
    the toon,north of newcastle
    never stripped/service one yet.looking forward to it though.
    done a few £1600 plus guns in the past but not the impact.
     
    MikaMutt and mmamonster like this.
  3. MikaMutt

    MikaMutt Engaging Member

    Messages:
    198
    Likes Received:
    196
    Location:
    Harwich
    Service complete, it’s taken so long because I was waiting for parts, special parts

    So while the gun was in bits, I couldn’t resist a bit of modification. Especially after talking to a Serbian chap who makes the parts for my mods.

    This might be worth a watch for those interested. https://www.youtube.com/user/vladankrosaki

    The rifle now has:-
    Enlarged transfer port in the barrel and probe.
    Added stainless steel Hammer weight.
    Modified valve seat housing.
    New titanium valve seat with 6.3mm hole.
    Delrin C3 bumper.
    Large external plenum.

    The increased air flow through the internals has allowed a big reduction in reg pressure, down to 105 bar from 140. Hammer spring tension has been reduced significantly and the rifle is much sweeter to shoot as a result. The rifle is producing 64ftlbs at 920fps with 34 grain JSB Mk11s and is printing 5 shot clover leaf groups at 55 yards. It responds to adjustment input much more positively and instantly than it did, it took ten minutes to find the ideal velocity for these pellets, very little, if any, dicking around.

    When I’d reassembled the rifle with the new mods, with the HST maxed and the reg pressure set at 130 bar (just happened to be that after reassembly), the rifle sent 34 grain pellets across my chrono at 985 feet per second!

    THIS is what FX should be making! These mods have turned an already excellent rifle into a very very very excellent rifle.

    Weather permitting, there’ll be 100 yard testing this weekend. I’ll post some pictures of results if anyone’s interested.
     
    mk2 and bucketboy like this.
  4. bucketboy

    bucketboy Keyboard Hero

    Messages:
    2,861
    Likes Received:
    4,330
    Location:
    peterborough
    Have a look at airgun nation, there is pages and pages of power upgrades on there.

    I am going to take my sub12fpe apart when I get time, there is something rattling on the inside that a dont like. I think there is a better way to get this gun to work at lower power levels than just fitting a weaker spring.

    when I pull back the cocking arm, from the time the dog starts to move the hammer until the trigger sear catches it, there is 22.5mm of travel. Pull the trigger and the hammer has to more forward 22.5mm before it hits the valve. Compared that to my other guns of 7mm.

    what I intend to do is fit a strong spring, better spring guides and give the hammer a much shorter run up before it hits the valve, this should decrease lock time, make the gun less sensitive to adjustment and reduce the horrible twangs and rattles the spring, guide and hammer currently make.

    I will report back when done.

    Bb
     
    metalman and Popgun like this.
  5. MikaMutt

    MikaMutt Engaging Member

    Messages:
    198
    Likes Received:
    196
    Location:
    Harwich
    The more I read, the more I believe that the Impact was developed as a high power unit, with a detune for U.K. sub 12 requirements. There appear to be ‘work arounds’ that appear not so very well designed/thought out, to get the power down.

    A shorter stroke would be a huge benefit but I wouldn’t know how to achieve that with the sling shot system.

    Tuning the things to higher power levels just gets them sweeter and sweeter.

    You’re reading the same forums as me (I’ve seen your contributions). FX were going to offer this after market tuning kit through Ernest Rowe from what I’ve read. That seems to now be not the case.

    Good luck with your modifications, I’d be interested to read about your progress/results.
     
  6. MikaMutt

    MikaMutt Engaging Member

    Messages:
    198
    Likes Received:
    196
    Location:
    Harwich
    All done and all set up, at last. Group was shot at 70 yards. Three shots, 15mm. Slight breeze.
     

    Attached Files:

    metalman likes this.

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