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Posted: 2/16/2005 10:23:05 PM EDT
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I have a new Bushy carbine that has an almost imperceptibly canted FSB. I only needed to move my ARMS rear sight a few clicks to the right of mechanical center to get it zeroed (and two clicks on the front sight post for proper elevation). My concerns are these: I have yet to be able to really wring it out and I am worried about long range implications of the canted fsb. As I said, you can barely tell by looking that it is ever so slightly canted to the right. Will Bushmaster see this as a valid complaint, or just me being a whiner that my new carbine isn't "perfect". It really bothers me and I will contact Jarrod tomorrow to see what he tells me. Any thoughts, guys? |
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If "a few clicks" means three or four, your adjustment is well within Army Ordnance specs for a newly assembled piece, and I seriously doubt the Bushie, or Colt, or anybody else would consider that a defect that needs fixing. All my ARs have actual zero between 2 and 5 clicks off of mechanical zero, and the one w/5 clicks off is a milsurp assembled M16A1 assy that came off an issued rifle. The ones I built are all 2 and 3 clicks off. It is almost certainly the result of a 2 or three thousanths of an inch off center positioning of the barrel locating pin in the slot at the top of the upper; well within manufacturing tolerances. Don't understand why you'd be concerned about longer ranges. If it's mechanically zeroed for windage at 100 yds, it will be mechanically zeroed at any range. Distance only comes into play when the piece is off zero. One inch at 100 yds=2 imches at 200 yds; etc.,etc. Don't mean a thing--not a thing 
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Hey, all! Yeah, I was kinda wondering if it was a non-issue since it doesn't seem to be way out of whack for zeroing, at close range. As for the concern at longer ranges, I'm sure that if you have ever shot prarie dogs at anything past 250-300 meters, or anything else at those distances or longer, you would know that any cant to the weapon can have adverse effects on POI vs. POA. Granted, I don't shoot my carbines at targets much beyond 200 meters, as a general rule, I don't want to be handicapped by the weapon from the get go. I can pull enough shots on my own without any help from the weapon, thank you very much... So, I called Jarred at Bushmaster today and was told that he would be out OOT til next Monday. Guess I'll try back then... |
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Boy, am I feeling like a dumbass... So, I still thought that it looked like the FSB on one of my new carbines was canted to the right just ever so slightly. Got to thinking of a way to prove/disprove to myself that it was straight, when lo and behold, I remembered my trust "crosshair square" from B-Square... With my trusty tool in hand (c'mon guys, you're not gonna let that one get past ya...) I levelrd my carbine and put the crosshair square along the handguards, and upper receiver bare, and with swan sleeve in place. You guessed it, I cannot see any cant to the front post. The FSB has rough milling that is not the best, nor even comparable to my other Bushy's, but it appears to be causing an optical illusion that makes the FSB look a little canted...but as best I can tell, it's not. Guess that's why I only had to take a few clicks to the right to zero the rear sight, which isn't bad at all. Well, my appologies to Bushmaster for buying into the hype, but it really looked canted. Guess it was a good thing Jarrod was gone today... All's well that ends well... 
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Are you sure it is the FSB being canted? Not questioning your knowledge here, but there have been numerous Bushmaster posts with the same symptoms reported. If I recall correctly, it was determined to be a barrel, or barrel connection issue. Either of which should be Bushmaster shop correction (or a certified gunsmiths) Just didn't want you going at the FSB if the problem were elsewhere. EDIT Here is another example of what I was talking about...Link Heres another.......another link to the same type of problem Anyone notice a trend here? ...another example of Bushmaster zero issue
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Unless the zombies come during that week while your rifle is back at Bushmaster, in which case you might be hosed. Good reason to stock up on a few "backup" black rifles before you send this one back to the mfg for repairs. 
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Thanks for the input, guys. Like I said, I believe it to be a non-issue, and it only took two or three clicks to the right to get the rifle zeroed (and two clicks up). I think that the milling of the FSB (which is really quite crappy looking, and off center) created an optical illusion that made my eyes think that the FSB was canted. I will fire the rifle at longer distances this next week and make sure that the paper bears this out... |
I was just using that as an example. I use a 700P LTR in .223 Rem w/ optics for those, and greater ranges...but I can consistantly nail 3lbs coffee cans at 300 meters w/irons and one of my Bushy's. I have not fired the new ones at that range yet... |
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