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Skidding bases

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/17/2007 at 19:56
jackG View Drop Down
Optics Apprentice
Optics Apprentice

Joined: November/27/2006
Location: United States
Status: Offline
Points: 141

I'm new enough to this game that my terminolgy is suspect.  I'll try and describe what's happened.  I purchased a Marlin, model 60, SS and synthetic, .22 LR.  It's not a 10/22, but I bought it for nostalgic reasons and those little rifles always shot well for me.  I had a BSA Sweet 22, 2-7 added.  The package is a classic plinker. 


From the first time out, right at the point when it's shooting where I want it, dead on at 50 yards, the scope bases, that is the "clamps" that bite into the mounting grooves on the receiver, slide to the read.  And no matter how careful I am, it sneaks up on me.  The first time, toward the end of the session, it suddenly was shooting clear over the top of the target backstop and hitting the berm behind.  I was with a friend who knows what he's doing and immediately diognosed it.  During subsequent sessions, I began tightening after every magazine fired.  But sooner or later I'd shoot several in succession without cranking on the base screws, and, ta da, there is was gain, clear off the rails in the rear. 


I went out today determined to get it done, and got everything working.  The thing was zerod and shooting really tightly, at least for my purposes.   At 50 yards I shot a 1.5" group and had 9 of 14 shots, in the bull, and went right on doing it.  I was delighted.  Bring on the gophers.   I concentrated totally on the shooting, and off it came again.  I put it back on there  using a key to tighten the screws and got it zeroed again.  I stopped at SWH on the way home.  They said, the bolt coming back and rapping against the back of the receiver delivers a hammer effect.  That coupled with the hard, slick SS, results in the mounts creeping to the rear.  They recommended some blue lock tight and cranking the screws really tight with a heavy screw driver. 


I did that.  I put a couple of drops in the rail slots at four points, two on each side, and slid the mounts over them.  Then screwed them down tight.  It's curing as I write this.  If that fails, what are my options?  Anyone have some suggestions?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2007 at 13:20
silver View Drop Down
Optics Master
Optics Master

Joined: November/04/2005
Location: United States
Status: Offline
Points: 2291



 The bases are not getting enough contact to the rails.  If you remove some metal from the base side where it tightens, not where it tightens to the rail, but the "c" forms



  Mount together      ;@|{------|8   Mount apart @|         - {------|--8

                                  [         ]                           [                  ]

                                                                                     ^remove metal here where the threaded fastener goes through. Put both rings togthere so that you remove the same amount of material from both.  If that does not work then get new rings.

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