Sheer nonsense. If anything, Bushmaster is upper mid tier. It is in no way in the same lower tier with S&W, Olympic Arms, Dpms and many others. Why don't some of you do some actual research into the specs and materials used before repeating internet nonsense?
Go to Lightfighter. Join. Read the AARs and search for Bushamster (spelled that way on purpose). There is a reason they are referred to like that.
My personal experience with Bushmaster (circa 2005-2007) (XM15 M4geries):
Rifle #1 - Ejection port cover would not close because there was a huge chunk of aluminum where a mill cutter had apparently broken off during machining and they assembled and shipped the rifle anyway....
Rifle #2 - Could not zero the rifle a 50 yards, ran completely out of left windage.
Rifle #3 - Gas problem. Either undergassed or loose gas key. Would not cycle through a whole magazine without a short stroke.
Rifle #4 - Could not get the rear pin out to take out the BCG to check the staking on the gas key. Dealer used a hammer and brass punch and could only get the pin out 1/2 way. I didn't accept the rifle.
(You would have thought I would have learned by now....
)
Rifle #5 - Okay. Still had to go 12 clicks left windage, but at least it was operable.
Rifle #6- Okay. Best of the bunch, nothing that I could find wrong with.
Rifle #7 - Okay. (Full sized HBAR model)
Is it possible to get a decent rifle? Yes. The problem is that with their QC system it was a roll of the dice.
Since closing of the Wyndam facility and the absorption of the brand into Remington and relocation of assembly to Illion, I don't know. I haven't tried to purchase a Bushmaster since 2007 (And I don't plan to either.)
As an aside. I had some Bushmaster spare parts on hand and after I got my Colt 6920 I disassembled them and compared the parts. There is a SIGNIFICANT difference in the quality of parts used the the Colt versus those used in the Bushmaster. I promptly sold the Bushmaster parts.
My only experience with S&W are 2 rifles that my buddies here at work have. They have no problems at all. Most trainers recommend avoiding Bushmaster, but do not say the same thing about S&W.