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6/5/2005 9:05:25 AM EDT
I am trying to figure out what's the deal with my uncles ar upper.  he's got a model 1 upper that wouldn't shoot for nothing.  It shot okay when he bought it new but after he installed a new handguard accuracy went to poop.  I've tried all my good loads&good match ammo  through it with bad results.  I'm thinking something's not put back correctly after the handguard install.  any thoughts on this?
6/5/2005 11:30:28 AM EDT
[#1]
what configuration of upper? are you using the same ammo through it as was used previously?

6/5/2005 3:08:07 PM EDT
[#2]
Did the new handguard require removing/replacing the barrel nut?  Could it be loose?  Can you twist the barrel in the receiver slightly with the front sight base.  Can you feel the barrel wiggle side to side in the receiver?
6/5/2005 9:53:23 PM EDT
[#3]
the configuration is the 24" 1.8twist/w floating handguard.  the ammo that were used before were bh's 75gr otm's. after the floating handguard was installed the bad shots occured....the barrel is in solid, no movements whatsoever...
6/5/2005 10:32:03 PM EDT
[#4]
iron sights? optics? make? model?
6/5/2005 11:28:30 PM EDT
[#5]
leupy mk4 10x scope on badger rings.
6/6/2005 12:30:19 AM EDT
[#6]
have you verified everything is tight on the mounts and rings and tried a different scope? inspected the crown?
6/6/2005 1:03:50 AM EDT
[#7]
Could be as simple as the scope going south as Tweak has pointed out (dancing POA due to the retension optic spring going weak). Try changing out the scope to a know good working one.

Trust me, I have a BSA on a flat top that goes south  about every year.  I keep meaning to just chuck the dam thing, but BSA keeps replaces it for no cost.  

I can tell when it going bad because my groups open up, and does not hold the same POA over a few mags (rifle allowed to cool between mags).
6/6/2005 11:53:10 AM EDT
[#8]
all the rings/mounts are on tight.  target crown is okay. the leupy mk4 is like new, no more than 6months old.
6/6/2005 11:57:06 AM EDT
[#9]
pull it apart, check all the pieces, and reassemble.
6/8/2005 1:11:39 AM EDT
[#10]

Quoted:
pull it apart, check all the pieces, and reassemble.



it was one of the first things that I did to the upper.
6/8/2005 2:49:24 PM EDT
[#11]
Gas tube interference ? Make sure it is not "bumping" the carrier key and in centered in the upper .
6/8/2005 3:02:30 PM EDT
[#12]
if this occured after installin a FF tube for the hand guard, i'd start lookin real hard at it.... is it mounted exactly to mfg's recomendations?...... it's sounding like it's contacting one of the recievers somewhere it's not supposed to, or the bbl....... i'd also check to make sure the FSB is secure, and that any muzzle attachment is as it should be....it could be as simple as a flash hider out of alignment....

keep us posted on what the fix is
skintback

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