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Posted: 5/9/2009 2:01:27 PM EDT
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Anyone else have problems with their SAI rear sights loosening? My first windage knob screw would loosen if you ddin't really torque it down hard. I tightened it and the top of the nut broke out (at the base of the screwdriver slot). SAI sent another.
I installed the replacement windage knob and tightened it snug, real gentle like.That was after I had to run a tap (8-36 or whatever it was the drawing calls for) through the threads that would continually try to cross-thread on the pinion. At the snug setting, the elevation knob would jump a click each time I fired the rifle. I tightened it until the elevation knob would no longer jump but then the windage knob would no longer adjust. I found out why; the windage nut broke again! Other than GI sights, any suggestions? |
| Walt Kuleck's book The M14 Complete Assembly Guide is indispensable. If you don't have it, I highly recommend it. You should back off at least one, if not two, "clicks" on the windage knob nut. This prevents breaking the windage knob. Just checking, is the elevation pinion shaft completely inserted all the way through into the windage knob? |
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Quoted:
Walt Kuleck's book The M14 Complete Assembly Guide is indispensable. If you don't have it, I highly recommend it. You should back off at least one, if not two, "clicks" on the windage knob nut. This prevents breaking the windage knob. Just checking, is the elevation pinion shaft completely inserted all the way through into the windage knob? Thanks for the tip. I'll have to pick that book up. Yes ,after I cleaned up the threads, the windage nut threaded cleanly in and down onto the pinion shaft. What do you mean by backing off in "clicks"? By clicks of the elevation shaft (since windage nut threads to the elevation pinion)? This raises another question: how tight should the windage knob be threaded into the sight base? |
| The little slot nut inside the center of the windage knob should be tightened to snug then backed off two "clicks" or two half-turns. Then you should try to move the windage knob so that the base moves to the left. You want to assemble the rear sight with the base all the way to the right hand side of the receiver when you thread the windage knob into the base. I just turn the windage knob clockwise into the base until it stops turning. Then I tigthen the slot nut in the center of the windage knob to snug then back off two half-turns. Again, the rear sight base should be all the way to the op rod handle side when you thread the windage knob into it. |
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