Originally Posted by
SmugPePe
All of them? Really? I must disagree.
The fsb... It doesnt matter really whatever its f marked or not. Non-f marked fsb can be used with a1&a2 upper and flat top and f marked can be used with a1&a2.
I know the difference between but its is so small that few more turns on front post or even taller one will fix any problem if you even have any.
The chamber on mine chamber and fire 77gr mk262 and 75gr hornady no problem it also shoot shit tula and brown bear with no problem. The chamber is on tight side compared to FN, dpms, and doublestar i had especially FN.
Only bad thing is the twist for some.
I have seen bushmaster lower and they are really well made. The a2 upper i saw have little maching mark there and there but not worse than colt a2 i have now.
By sketchy i mean their qc is up and down throughout history of company. They would have those silly whoopie yet scary often, like not tighting barrel nut to spec sometime almost only hand tight. Poor staking on gas key and bolt lug shitting the bed early sometime.
Oh and the barrel is cut better than colt and doublestar. I saw alot chatter marks in those but in bushmaster bore there are none.
I really really like FN bore too their land is rounder and taller its just the way they are made by chf.