Do you have a retort on the history and engineering of the CAR buffer? Because I just read some Facebook gun group horseshit response "BRAND X DOESN'T USE IT SO IT'S SHIT".
The H and H2 buffers were created to fix issues due to fully automatic fire in the 920 series. That is historical fact without emotion.
And my personal experience is people want to swap parts before they even vet what they have because they read it on the internet. Open nearly any "My new Glock is malfunctioning" thread and it's because it's all aftermarket parts. Just like I'm sure there was a respected PF member that probably recommended a BAD lever.
BRO, WHY DO MANUFACTURERS FOLLOW TDP AND ECONOMY OF SCALE?
You are taking the discussion on a tangent that does not follow my statement. My argument is any properly-built AR-15 carbine can use a CAR buffer. The heavy buffers were designed for automatic fire issues and the only AR carbines that truly benefit from an H would be an upper without M4 feedramps.
Almost is the key word. PF is an awesome site with awesome shooters, but we are all human.
Regardless, I'll still stand by my point that buffer weights are largely pointless on an AR-15 carbine due to it being semi-auto only. I would concede that they are requirements if you have a select fire M4 or M4A1.
I’d go heavier. I’ve experimented a fair amount and really haven’t noticed too much difference honestly so I just like to be somewhere in the middle. CAR and H3 are on opposite ends just as A5H0 and A5H4 are so I like somewhere around the H-H2 or A5H2-A5H3. The only thing I can say for certain is that changing springs and changing buffers is not the same thing. They’re obviously related but putting in a green spring and A5H1 is not the same thing as a standard rifle spring and A5H2.
Realistically the recommendation of whatever your upper’s manufacturer recommends is probably the best one, seeing as how you have solid uppers. They’ll probably recommend a light buffer anyways since they want their guns to run but I’d be surprised if BCM didn’t use at least an H buffer in their 11.5s.
On the emotional argument about necessity, it’s the same as always. Colt 6920 works so it’s fine, but KAC SR-15 is going to be better. Just depends if you want to spend the money and accept whatever risk there is from diverting from “fine.” In this instance, it’s not even $50 unless you start toying with the A5 system, is easy to put back to how it was if it doesn’t work, and assuming you’re able to test it enough to feel confident in it, there’s really not a downside.
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Who said a properly built AR15 wouldn't run with a carbine buffer? Nobody in this thread. You saidThat's an incredibly foolish statement. If you'd said they weren't necessary for function, that would be a different story. My rifles, factory built or by me, from reputable manufacturers will all run on a carbine buffer. They run smoother with heavier buffers. To say anything other than a carbine buffer is pointless is borderline fudd lore similar to .45acp stoppin powah.Buffer weight is pointless on a semi-auto AR.
Colt, BCM, Daniel Defense, SOLGW, Geissele, LMT, all use H or heavier buffers. Are they wrong? What do you know that they don't?