Quoted: Does anyone know what Bushmaster does when you buy a flat top rifle/carbine from them along with a Bushmaster DCH? Do they use a taller front post or the F FSB?
AFAIK RRA and DPMS only use commercial spec DCHs and thus would work with any FSB combination.
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Having just had an argument w/the Bushmaster guy who runs their thread on this site, a week ago, when I ordered a 16" barrel, and specified that it come w/the higher post; I'll be happy to tell you what Bushie's totally incorrect psition is. They use the standard height front sight base AND blade on their carbines----because Colt has told them that the Colt sight unit is higher than anyones elses on the flat tops, and that's the reason for the F base.
And like the guys on this site who keep on insisting that 's the reason, he totally ignored the fact that Colt has ALWAYS had a higher front sight point on their short barrelled pieces---all the way back to the XM177 SMGs in Viet Nam. Wouldn't respond when I pointed that out to him.
People; I've got a round profile front post, that came on the SP1 carbine I bought in 1978. It's .040 higher than the front blades I pulled off the milsurp M16A1 upper assy I have, when I changed all my front blades to current square types. I work with a former service armorer who remembers they had to keep two heights of front sight on hand, for the occasional SMG that came through the shop in the immediate aftermath of Viet Nam
My M4gery, with a Rock River barrel a Conti flat top upper, and a BUSHMASTER sight unit, needed a .040 higher front sight blade.
So my word to any of you who have carbine types is, if the front sight base ain't stamped "F" on the left side, order a higher post from Buishie (part #9349056-M). And if it ends up that you can get away w/a standard post, just screw the higher one down a few clicks, but I doubt that you'll have to,
Oh, by the way, when I pointed out to the Bushie guy that others have posted on their thread about needing a higher post on the carbines, his response was; "You should see all the nut case idiot postings we get on that thread". So if any of you have ever posted on that thread, now you know what the guy who runs it thinks of you