AR Sponsor
Posted: 4/7/2004 11:11:17 PM EDT
|
Hi all. I've got a gov't profile barrel with an A2 FST. I installed it on a Rock River flat-top upper using the JP float tube. It came together pretty straight-forwardly except for some extra tapping/pounding on the FST pins to get them in/out (used small ball been hammer and Starrett punch). I am using the LMT rear fixed sight on the flat-top. There is not enough windage to sight-in at 25 yards. It's still impacting about 4" to the right with the rear sight cranked all the left. I've had a barrel with a slightly canted front sight tower before, but this one looks straight. Looking from the rear and comparing the FST vertical-ity vs. the flat-top, it looks perfectly straight. In the FAQ, besides the FST being canted, other causes for excessive windage are: bent barrel, barrel not seating under barrel nut square, and not square upper face. How can I check for these and narrow down the problem? thanks -z |
|
Have you bore sighted it? Very easy, just clamp the barrel in a vise with a set of blocks, swing the vise so you can sight in on a distant verticle line (I use a power pole about a klick away), and ferify it is centered in the sights as well as the bore of the barrel. This should point out any mis-alignments. |
AR Sponsor