Armory Sponsor
Posted: 6/23/2003 8:34:56 PM EDT
|
(Reposted from General Discussion) Shoots high & to the left at 50 yards - very high. Like every time. Doesn't matter if I use the OKO Red Dot only. Or the iron sights (front post + flattop rear tactical carry handle). I've tried this with the front post raised all the way, w/ all the OKO adjustments I can. I've damn near had better luck just using the front sight post! Can the front sight post be screwed up? The rear carry handle? Plz help! |
|
RRA Lower & Upper, Bushmaster chrome lined M4 barrel - 16 inch, Ak comp. Has always shot high & to the right - even when it had its original barrel. With every sight set to its "normal" "unfiddled with" position it shoots - seriously - like a foot and a half high! Shoot Winchester 55gr FMJ out of it on the range religiously. Maybe 4-500 rounds sicne rebarreling, A couple of thousand w/ old barrel. Before rebarreling I had it about dead on in aim w/ the tac handle on & then the OKO on top of that. Since rebarreling zero was wayyyyyy off w/ the same setup. Oh, and no damage at all to the barrel or crown... |
|
ODD, very odd... same results with 2 different bbls'  ever try bore sighting that thing? viewing thru the bbl, line up on a distant target, veryify with iron sights. also checking for warpage in the receiver and front sight post. if everything looks ok, I'd susspect some sort of problem with your shooting technique. Has anyone else shot this with the same results? |
|
Yes, buddy of mine, a former Marine grunt, - same results. The guy is a dead-on-shot w/ every other weapon I've seen him shoot & that's what worries me. He had to fiddle w/ the damn thing for 45 minutes to find zero. Next time I went to the range, it had lost it. He suspects a problem w/ the front sight post. I don't think the fact that the tac handle w/ the rear sights is removeable should be a problem. I'd say it's my bench shooting technique, but I can't find any flaw in my buddy's... Going out to range again today to fiddle w/ it - will post report later tonight... |
|
Unless the barrel is bent or otherwise damaged, the problem HAS to be that the upper receiver has been machined out-of-spec. Otherwise, there might be a problem with the irons, but there wouldn't be a problem with the OKO. The fact that both systems have a problem indicates that either the barrel is damaged, the fit from barrel to receiver is screwed up somehow, or the upper receiver is way out of spec. If you know someone with rebarreling tools, take it there. Otherwise, send it to a good AR smith to figure out the problem. -Troy |
|
With my front sight post's base flush with the top of the sight post threads it is .325" tall. That puts the top just a hair below the "ears" of the sight housing. That is about .025" taller than the standard I believe. The DPMS guy I talked to at a gunshow said they made the extended posts for A3 uppers. |
|
OK, had a smith check it out. he says the barrel & front sights are lined up perfectly and everything else fits flush. Wierd. He suspects that a.) the front sight post is too short - as others have suggested, and b.) the removable tac handle is not the best option for rear sights. suggested mounting the OKO to the flattop & buying a rear flip-up sight. Sigh, this is all annoying... I think I'm gonna sell it, get an AK, and wait & see what happens w/ the AWB before buying yet another AR. |
|
I read in the Bushmaster catalog that if you use a detachable carry handle you NEED the taller front sight post. The detachable carry handle does not sit at the same level as a standard carry handle. Just buy the taller fron sight post from Bushmaster and see if that fixes your problem. This is what the ad says.. A2 square front sight post for flat-tops...$4.95 A3 removable carry handles are higher than mil. spec. and require this .040 taller front sight. |
This is very strange. I bought a NIB Bushmaster from Bushmaster with an A3 handle. I had no problems getting it sighted in right from the factory with the carry handle. In fact it was within 2" right from the factory. According to you and Bushmaster it should have come with a taller front sight post. It did not because when I removed the handle and put on an Eotech and tried to cowitness with an ARMS #40 BUIS I could not. Had to buy the taller Trijicon front sight post. Something's fishy......... |
How can it be a front sight problem if it does it with the OKO red dot sight as well?
You just answered your own question. Either the barrel is damaged or installed wrong. |
|
Return that barrel for another one as it has a problem. Iron sights, especially the front sight can be installed incorrectly at the factory, just a screw up, but with a scope or electro-optic this should not be an issue. Ya got a barrel problem here. Only fix is another barrel. We had a pretty well worn Korean issue Garand one time and sold it to a guy. It checked out okay with guage but shot all over the road. There was nothing we could physically find wrong with the barrel, sights loose ect. We replaced the barrel and magic, the gun shot well and to the point of aim with the sights well centered. Some times barrel problems cannot be detected with a visual. Denny |
|
Well, as I said before, I sold it and got 2 guns I can use right away instead. Having other deb obligations that come first, I'm gonna hold off on another AR purchase until the AWB issue is resolved next year. I do think it was a combination of the front sight post & barrel mountin that caused the problem. The thing wasn't Milspec to begin with. It was one of the LEGP's that RRA did not mill correctly, and then they & Castle Arms failed to pass the little tidbit along until buyers themselves exposed the problem. I never could fit a flip up rear sight on the damn thing... |
Armory Sponsor