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Posted: 2/19/2006 2:48:24 PM EDT
My attempt at a genuine tech question despite being a newbie to assembling AR's.

I have purchased 2 slightly used Bushmaster uppers that I will be assembling in one config or another.

My question is: if I decide to assemble an accurate varmit rifle, what influence does the upper have on accuracy, or is it all in the barrel and bolt/ lockup/ headspace? Strictly referring to the rifle, not ammo.

Since I have access to tool room equipment and tools, CMM, etc., is there anything I should measure on the uppers, e.g. the bore for the bolt?



Link Posted: 2/19/2006 3:20:14 PM EDT
Are you talking about upper receivers with NO barrel? The upper receivers themselves have no bearing on accuracy.
Link Posted: 2/19/2006 3:34:35 PM EDT
[Last Edit: 2/19/2006 3:35:21 PM EDT by toddlerp]
With no barrel, I would be throwing it rather than shooting from it. But that would defeat the intention I have for the upper.

Once assembled as a complete rifle. I do not know what influence an may have on accuracy once a round is chambered.

If you were referring to my inquiry on inspection, I meant without a barrel, inspecting the upper prior to assembly. This is a used upper.



Originally Posted By M4Madness:
Are you talking about upper receivers with NO barrel? The upper receivers themselves have no bearing on accuracy.

Link Posted: 2/19/2006 4:51:49 PM EDT
The accuracy is going to come from the barrel. Headspace is set at the factory via the barrel extension, so the upper plays no part whatsoever in the equation (other than attaching the barrel to the rifle.)
Link Posted: 2/19/2006 4:56:18 PM EDT
the upper reciever has close to no effect on the accuracy unless it is damaged or warped but then it wouldnt even function then.
Link Posted: 2/19/2006 5:29:50 PM EDT
Appreciate it.
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