A5 does not mean "heavy" stocks. The same stock bodies that fit a normal mil-spec receiver extension will also fit the A5 extension.
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Slightly off topic...
One of the things we see over and over again, on this site and others, is people tainting their comparisons.
"I was faster with this optic"
"were the guns identical"
"no, one was my buddy's gun"
"how was it different"
"it had a brake on it and..."
or
"I was more accurate with this barrel"
"were the guns identical"
"no, one was my buddy's gun"
"how was it different"
"his had a 4x optic on it and mine had an ML3"
I don't know if people don't know, or don't care, that these kinds of "tests" are virtually useless. At the very least it would be nice if they disclosed them when they offered up their one-line opinions. The excuse of "I don't have time to type all of that" is not valid. Hold your tongue (fingers?) until you do have time and post a complete, useful, opinion.
("you" used in the generic, not directed at YOU)
So with this buffer system it may well matter if the shooter has a CAR stock or an Emod on the receiver extension.
Prime example of this is triggers. People run a bunch of drills when the start and establish a baseline performance with a stock carbine and few gizmos. They take piles of training and then buy a bunch of useless shit. They then run the old drills and smoke them. Instantly it is the gear that made them faster and more accurate, not the fact that they trained away most of their flaws.
Muzzle break test with an accelerometer, will also be able to compare felt recoil of different buffers/springs.
And in regards to the Marines testing... Often times their testing is not set up to test stuff you or I might be concerned with, just what they are concerned with. I am unaware if the details and thought processes are outlined anywhere for public consumption.
I do know that when people get wild ideas they overlook too many important details in favor of minutia, I don't expect different here.
Rob is the one doing the testing. I would love the budget to do some of the testing and tinkering people have been doing as of late. Too much stuff is being missed and skipped when they dive into stuff and try to prove/disprove things.
I'm pretty sure you don't need the spacer, the extra length of the a5 buffer shouldn't matter much regarding spring compression or buffer travel, while a spacer will change spring compression compared to a real a5.
Although if your spacer is slim enough that the buffer spring fits in the tube around the spacer, I imagine all you did by adding it was add some mass to the back of your weapon.
Or maybe I'm going crazy from all the meds I'm on.