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Thread: B-Square Slip over no-drill mount for GP 100

  1. #1
    Boolit Master

    TCLouis's Avatar
    Join Date
    Mar 2005
    Middle TN

    B-Square Slip over no-drill mount for GP 100

    Several years ago I bought this mount and thought it would be perfect since it also has a tunnel so one can see the sights.
    When tighten all three screws down SNUGGLY, the mount still walks forward with each shot with moderate loads. With full power loads it races forward until the first screw in the mount contacts the back of the front sight.
    For those unfamiliar with this mount , it slips over the barrel and has three screws that cause the mount to "clamp" down on the barrel when they are tightened.
    It holds quite securely until one starts applying the recoil impulses of firing.
    Maybe there is a good reason one does not see them around any more.
    I have thought about drilling crosswise through the mount and barrel rib assuming a screw through both would have enough strength in shear to hold it in place.
    Not sure the impact on the barrel though, not strength, "accuracy"


    Anyone have any "solution" to the slippage problem?
    Last edited by TCLouis; 10-06-2018 at 03:36 PM. Reason: Add the purpose of the posting.
    Nothing is impossible for the person that does not have to do it.

  2. #2
    Boolit Master roverboy's Avatar
    Join Date
    Feb 2010
    I don't know how you stop the slippage, other than drilling and tapping. I'm quite sure you don't want to do that. B-Square has made several no drill bases and most don't work all that great. No offense to them.
    Mrs. Hogwallop up and R-U-N-N-O-F-T.

  3. #3
    Boolit Master slughammer's Avatar
    Join Date
    Mar 2005
    SE PA
    I'm guessing the mount is anodized aluminum? Probably slick and shiny.

    You could rough up the surface with some sand paper so it gets a better grip on the barrel. Use rosin, sticky tape or anything else that usually works with scopes slipping in rings. (Loctite, nail polish or paint work too but are harder to clean off).

    Please don't cross drill through your barrel lug!
    Happiness is a couple of 38's and a bucket of ammo.

  4. #4
    Boolit Master Drm50's Avatar
    Join Date
    Jun 2016
    SE Ohio
    I don't do optics on handguns. I bought a S&W m19 6" with a scope & no drill mount, owner had saved rear sight or I might not have bought it. Anyway took of scope and mount to replace back sight. On both sides of frame just ahead of forcing cone the blue is wore of from the no drill mount
    walking from recoil. If I did mount scope it would be with a mount that is held by screws that gun
    would have to be D&Ted for.

  5. #5
    Boolit Master bdicki's Avatar
    Join Date
    Mar 2010
    Central Florida
    I have one that clamps on the barrel but you also remove the rear sight and uses a sight holes to mount the mount . I had it on a Ruger Redhawk 41 mag with no problems.
    Last edited by bdicki; 10-08-2018 at 07:57 PM.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check