The issue is puzzling. Absent a muggled muzzle crown or an over-torqued barrel nut, I'm clueless. I'd contact Paul at BCM. I'm sure he'll work with you. This performance is decidedly uncharacteristic of his products.
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The issue is puzzling. Absent a muggled muzzle crown or an over-torqued barrel nut, I'm clueless. I'd contact Paul at BCM. I'm sure he'll work with you. This performance is decidedly uncharacteristic of his products.
Thanks to all for your input.
Crown looks good - I can see no nicks or damage.
Removed the handguards and though I do not have a barrel nut wrench, it appears to be tight (have no idea on torque). Grabbing the upper receiver and barrel, there is no apparent movement or loosness between the two (if that means anything).
I will wait to hear from Paul - I'm sure he'll ask for it to be returned which I will gladly do. I'm sure it will be taken care of and I will keep this this thread updated.
Update
BCM has already responded to my email (on a Sunday!) and have provided the information to ship the upper back. It will go out tomorrow.
Here is a thought: the barrel threads' concentricity to the bore.
I have a 14.5" gov't middy (Sabre) that has a permed A2X flash hider. When attempting to use a laser bore sighter before going to the range, to get the irons close, I noticed that I was unable to get any consistency at all, unlike other uppers I have used this bore sighter on, with shorter muzzle devices. It is a bore sighter with the cone shaped end, that indexes the sighter in the bore.
Well, scratching my head, and taking a closer look, it was obvious that the muzzle threads, or possibly the flash hider's threads, were not concentric to the bore. The sighter would bend and bind a bit to the side, when seating it inside the muzzle. But, this condition didn't really affect accuracy (that I can tell), with the A2X flash hider, but I suppose that it definitely would, when attaching a long brake, like the PWS FSC556. I would bet this may have something to do with your problem. This is another reason I didn't want to risk a permanent brake on a factory upper, that I couldn't verify thread concentricity.
Last edited by Jimbo45; 08-30-10 at 09:00.
I think the problem is caused from you posting pictures of the rifle prior to shooting it. Now it thinks that it is pretty and feels like it shouldn't have to work hard. You can either get it fixed, or simply yell at it and slap it a few times to put it in its place, followed by ignoring it for a couple of days.
Just kidding. Nice rifle, I'm sure it will get fixed soon. I want a similar upper. Show us the groups when you get it back please.
Did you check the optic and mount?
I was wondering about the optic and mount myself. I had a duty gun earlier this year that was grouping terribly. It wasn't until I had a fellow officer shoot it, that we noticed I had put the Larue mount on half assed. Once it was tightened down, it ran fine.
i did that once, a billion years ago.. not even sure what kind of mount it was. must have been a QRP... i don't think any of the current mount manufacturers existed yet, then.. but my groups went from crap to crazy pretty quick- first group was like 5" at 50, opened to like 10", to finally closer to like 4 feet- i had holes in other people's boards. i wiggled my barrel, we checked the cartidges for damage, inspected the muzzle/MD for damage/obstructions... finally, my spotter poked his finger at my RDS, which visibly moved under the pressure. d'oh! we were embarrassed.
first thing to check.
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