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Tool Talk Discussion Forum

Scope Bases

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Greg Martin

11-07-2004 18:38:45




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How would you find true center of a rifle barrel to drill for the bases, don't know that I want to do it, just wondered how they do it. Thanks, Greg




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Bill CA

11-11-2004 23:05:14




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 Re: Scope Bases in reply to Greg Martin, 11-07-2004 18:38:45  
Once upon a time I was a gunsmith. I'd true up the receiver in a padded vise so that it was level, then set a metal strip (~1/4" thick x 2" and about 18" wide) across the top of the receiver, perpendicular to the receiver and level. Brass works really well because it marks easily, but anything with a very smooth surface will work. Even plastic.

Get it level, resting on the receiver at about the position you want to mount the bases or rail. Then run it lightly fore and aft. That will mark a center line to drill. Go from there. Stay square to the receiver. Frankly it"s largely aesthetic, since the sight adjustments take care of the rest.

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jeffcat

11-07-2004 22:54:44




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 Re: Scope Bases in reply to Greg Martin, 11-07-2004 18:38:45  
As long as you have plenty of BRASS and you have the correct drills a VERY good eye etc. A gunsmith is not that expensive and they have the correct tools. I built several AR-15s and have the blocks and vice jaws to do it. Wouldn't drill into a barrel cause once it goes too far..... . Up to you. Jeffcat



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KraigWY

11-07-2004 20:46:09




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 Re: Scope Bases in reply to Greg Martin, 11-07-2004 18:38:45  
www.brownells.com sells a center finder, a v-block with spirit level and center punch. Reasonably priced and easy to use. Just set the v-block on the reciever (making sure the receiver is lever). Line up the spirit level on the v block, when you have the v-block over the location of the screw whole, tap the built in center punch, remove the blocks and start drilling. Its really simple.



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lucass

11-07-2004 18:41:56




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 Re: Scope Bases in reply to Greg Martin, 11-07-2004 18:38:45  

we use a fixtuer like a lathe bed to do it. brownells sells them . lucs



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Bill in TN

11-10-2004 04:25:41




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 Re: Scope Bases in reply to lucass, 11-07-2004 18:41:56  
How about a dial indicator?



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