What are the odds of this happening? Bushmaster barrels not torqued properly to upper

[wildmann43]

This is an incredible coincidence for me. First I have to tighten an obviously loose barrel (wobbly) in a Bushmaster Dissapater upper, a few months ago, & now a customer wants to swap an A4 upper to an A2 on a(new?) Bushmaster pre ban upper, & after removing the gas tube, the barrel nut is finger tight. This upper wasn't wobbly, it felt tight when you held it. But geez, what are the odds that someone would run into 2 different type uppers from the same reputable company, with the same assembly flaw? The bitch is, that average Joe can't tell if there's a problem unless the barrel feels loose, or he takes it apart to "blueprint" it.
Anybody else noticed this, or did I work on two random 'Friday afternoon' uppers?

[drobs]

I've noticed that the rear sight on the Bushmaster A2 rifles are loose or wobbly. Had a customer come into the shop and complain that the whole rear A2 sight assembly moves. I went and checked the other rifles in shop & found the same.

Went home that night and checked my Rock River. A2 Rear sight assembly was tight as can be, no rattle or wobble.

I think Bushmaster's quality control is starting to lack. Maybe they turned out too many rifles for the military contract which they no longer have.

I ordered my Rock River from the factory, took six weeks to get in house. Those guys take their time & have the quality to show for it!

[wildmann43]

especially on the qulity of RRA. I guess you noticed your gun was sighted in too, when you first fired it. Mine was apparently factory zero'ed.:D

[bushbanger]

I thought A2 rears were suppose to move from side to side? I have 3 different AR's from three different makers and all rears have side to side movement

[drobs]

Was over on another board & posted this same question got some good reponses with references to Armalite Tech Notes.

Here's the link to that page:

http://www.ar15.com/forums/topic.html?b=2&f=28&t=140956

and here's the tech notes on the wobbly sites:

http://www.armalite.com/library/techNotes/tnote18.htm

Also here:
http://www.zediker.com/books/ar15/holliger.pdf

This is kinda neat, Armalite has all their tech notes listed here:

http://www.armalite.com/library/techNotes/techNotesMain.htm