I am looking for any information, good or bad, about this upper. I have been shooting more 77 and 75 grain bullets and have considered this upper, but there is not much in the way of independent reviews. Any information is appreciated.
Cheers, Steve
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Member
I am looking for any information, good or bad, about this upper. I have been shooting more 77 and 75 grain bullets and have considered this upper, but there is not much in the way of independent reviews. Any information is appreciated.
Cheers, Steve
Member
It would appear these must have not been very popular or they have been flying under the radar. They have a SS 1/7.7 barrel and I was curious how they shoot the heavy bullets as opposed to the standard BCM ss barrels.
Cheers, Steve
Member
This is pretty basic info that I assume you already know but seeing as how nobody else has chimed in:
I managed to land a spot in one of his carbine classes back in '18. He was running one of those uppers and talked about it a bit.
He's a big fan of mk262 and apparently (unsurprisingly) has enough pull with BCM to have barrels cut with different twist rates until he found what worked best with that specific load. Presumably it shoots other heavy loads well too.
I haven't seen much feedback about them (like you, I suspect they go under the radar) but my vague recollection is that they are solid performers.
Unfortunately the list of gear I want vastly outpaces my finances, but I'd like to pick one up someday.
Last edited by jason el cuerdo; 03-24-20 at 23:48.
Senior Member
So the difference between this 1:7.7 and a 1:8 twist barrel is .07 more twist. How much can .07 of a rotation have on a bullet?
I will see Kyle on Monday and I’ll try to ask.
AQ planned for years and sent their A team to carry out the attacks, and on Flight 93 they were thwarted by a pick-up team made up of United Frequent Fliers. Many people look at 9/11 and wonder how we can stop an enemy like that. I look at FL93 and wonder, "How can we lose?". -- FromMyColdDeadHand
Senior Member
Not even measurable unless there was a decent size sample of each. If you just shot a few barrels of each, you couldn't really learn much because each barrel is its own animal.Originally Posted by ggammell
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Member
Jason thank you for your insight. Mark and gg, those are my thoughts as well. I look forward to any further info that gg can offer if he speaks to Kyle. I did reach out to BCM and they said ,"That twist rate was designed and spec’d by DEV Group for the 77."
Cheers, Steve
Member
Your math is a bit off... .3 difference...
Senior Member
If a 1:8 twists twice in 16”, a 1:7.7 twists 2.0779 times in 16”. That would be .0779 more twist in the same barrel.Your math is a bit off... .3 difference...
Go back to school.
AQ planned for years and sent their A team to carry out the attacks, and on Flight 93 they were thwarted by a pick-up team made up of United Frequent Fliers. Many people look at 9/11 and wonder how we can stop an enemy like that. I look at FL93 and wonder, "How can we lose?". -- FromMyColdDeadHand
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