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BT-99 Plus recoil reducer

Discussion in 'Shooting Related Threads' started by winchesterkid, Mar 29, 2010.

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  1. winchesterkid

    winchesterkid Member

    Jul 9, 2007
    Can the recoil reducer on these guns go bad or have any problems? Was shooting yesterday, had several shots that had a different feel than usual. Any suggestions would be appreciated.
  2. omahasportingsupply

    omahasportingsupply TS Member

    Jan 7, 2007
    Midwest gun has one for sale on Ebay, if you are interested. No relation.
  3. Barrelbulge(Fl)

    Barrelbulge(Fl) TS Supporters TS Supporters

    Aug 27, 2007
    West Central Florida
    Yes they do go bad. Below is a PM sent to me on the fix.

    Bulge, If you are not afraid to take it apart........pull the spring out....grind one coil off....and that will lighten up the recoil......if it is still too heavy...take it out and grind the second coil off.....

    BEFORE you start grinding.......take the spring to a hardware store and see if they already have a shorter spring that will fit.

    The unit is basically a very good system....so I wouldn't go buying another system.

    My opinion...and I've owned several Citroi Plus guns.
  4. stokinpls

    stokinpls Well-Known Member

    Jan 29, 1998
    A common problem is eventually the plug at the rear will wind it's way out of the reducer freeing the springs. It's staked in place when originally made, but can work loose. If you have cranked the butt pad in to reduce the length of pull, it may be far enough that it can't come all the way out.

    Make note of the length position of the pad (how many threads are showing), loosen the set screws (there may be three), wind off the pad - if the end plug has come loose, it will fall out(be careful), remove the two slot head screws and the plate from the stock, make note of the direction of the reducer (so you don't replace it turned 180 degrees when on the way back - the canting notches will be backwards), remove the two phillips head screws from the stock and slide unit out. See if maybe the end plug has come loose - it should be flush with the base. If you decide to explore further, either photo or diagram the order the parts are removed. Doubtful anything is broken, but things with threads can work loose over time. Good luck.
  5. E. Beaver

    E. Beaver Member

    Oct 27, 2007
    Here is a fix in detail:



    My used BT99 Plus has a system that is a two-stage affair, with the first stage on the light side and then about half way through the second stage starts and it is much stiffer. It clunked when compressed. The first stage was so light that sometimes just as I was going to shoot it would compress a bit and mess up my shot.

    Took it apart, cleaned it up, oiled it and noticed that if I advance the innermost “plug” a little I could get rid of the clunk but this shortened the overall travel and upped the stiffness a little. Using a bathroom scale the maximum compressive force was 45 pounds.

    A rebuilt unit recoil unit purchased wherein the plunger holding the innermost spring was removed and replaced with a second smaller spring that fit inside the innermost spring. Removing the plunger deactivated the heavier outermost spring leaving the total recoil determined by the original forward spring and the new smaller spring. The maximum compressive force of this set-up was 35 pounds. I liked the feel of the now single stage compression as it was smooth and continuous but it was too light for my use.

    Went to the local Ace Hardware store and picked up some likely springs.
    The heavier spring was 2.25” long, .715” OD, .090” wire and 11 coils and an approximate value of 40 pounds/inch. A lighter spring was 2.0” long, .428” OD, .054” wire and 15 coils and an approximate value of 15 pounds/inch. I ground the ends of the heavier spring to shorter it about 1/8” so it would permit full travel under compression.

    With the heavier spring installed in the forward position it gave a maximum compressive force of 50 pounds. With both springs installed the max force was 60 pounds. The maximum travel was a little over 3/8”. Springs vary so your values might be different. I shot 50 Remington Nitro 27 (1235 fps) with both springs in place and really appreciated the smoothness, no noise and the recoil reduction. I’ll try it with just he heavier spring next time.

    This is a fairly straightforward changeover and the whole system can be changed back to the original without any permanent change to the gun. Below are step-by-step instructions and use them at your own risk.

    1. Loosen the setscrew several turns in the recoil plate.
    2. Unscrew the recoil pad and plate plate.
    3. Remove the two screws holding the stock plate.
    4. Remove the two screws holding the reducer assembly.
    5. Remove the assembly from the stock.
    6. There is no need at this time to remove the plug from either end of the assembly.
    7. Clamp the assembly lengthwise in a large vice or use a “Pony” clamp etc and compress the unit about ¼”. This removes any strain on the small screws holding the assembly together.
    8. Remove the two small screws located in the slots of the assembly.
    9. Carefully release the clamp and separate the assembly.
    10. Remove the spring and plunger from the forward part of the assembly. Nothing needs to be done to the rearward part of the assembly.
    11. Clean the mating parts and check for free movement, polish if necessary.
    12. For approximately 50 pounds of compression use only the heavier spring. For approximately 60 pounds of compression use both the heavier and lighter springs.
    13. Position the whole assembly in the clamp and compress until the threaded end where the pad plate is attached is almost contacted. If you are more than about 1/16” away from the threads you will need to shorten the springs.
    14. When grinding the ends of the springs dip them in water frequently to keep from overheating and changing the temper.
    15. Check the compression force and free movement using a bathroom scale etc.
    16. If you have installed both springs you have the option of using the forward plug to adjust the tension of the smaller spring. Double check that you have full travel.
    17. Reassemble in the reverse order.

    This turns your recoil system into a smooth single stage system. Good luck and good shooting.

  6. soup

    soup Member

    Sep 2, 2008
  7. winchesterkid

    winchesterkid Member

    Jul 9, 2007
    Thanks so much to everyone for your help.

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