Anyone tried this combo? I'm assembling the parts to register a SBR, and wanted to hear people's thoughts.
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July 22, 2023, 08:39 PM
MrMcGoo
Any stripped AR 15 lower should work. It takes a SIG MCX stock adapter and an MCX lower parts kit which are both available on SIG's web site.
Bill
July 23, 2023, 06:50 AM
AUTiger89
That's what I thought as well, but I talked to a guy yesterday who said Aero Precision lowers were finicky with other companies' uppers. I hadn't heard that, and am skeptical, so I thought I'd reach out and see if others had tried this combo.
If the lower is finicky, I'm fine going with an Aero upper, but it seems their method of adjusting the gas, which requires an Allen wrench, is a little awkward. But the lower is excellent quality.This message has been edited. Last edited by: AUTiger89,
Phone's ringing, Dude.
July 23, 2023, 11:54 AM
pepsiblue
MCX upper require an adapter to fit on any AR lower. Brand or quality isn’t an issue, they are designed differently.
10mm lays waste to entire cities, cuts through diamonds and will tear Superman a new asshole. - Parabellum
Sex offenders can not be rehabilitated. It's in their wiring. They should not be released back into the general public. On the other hand they should not be warehoused either. I think they should be executed.....Spectre
When someone tries to kill you, it doesn't matter how they are doing it. You're in mortal danger, and it's time to try to kill them back.
Arc. ___
Kill every last one of these goddamned animals. We need a president with balls. We need leadership. We should be carpet bombing these barbarians wherever we find them, and we should be looking for them 24/7. We have to unleash Hell upon them. They understand nothing but death, so death is what we should bring them, wholesale.... Para
I left "practical" behind many years ago. It was covered with my first Glock 19. (Fredward)
July 23, 2023, 02:31 PM
MrMcGoo
The only things that are different with an MCX lower are that the recoil bumper is integral and the MCX uses 6061 billet aluminum. If memory serves, the Aero lower uses 7075 aluminum forgings.
The 7075 is stronger, but corrodes a bit more easily than 6061 aluminum. The two parts that the SIG MCX lower parts kit does not contain are the right side magazine release button to fit a standard lower and the closure for the trigger guard.
The MCX upper has a firing pin safety on the bolt carrier. Hence the fire control group's hammer must be able to move the safety out of the way with enough force to fire the round.
SIG offers the Match Lite Duo two stage trigger to get the job done.
I don't recommend the Aero upper. The SIG barrel and bolt carrier are designed to work with the SIG upper only. I've never heard of an MCX with any upper other than SIG. SIG's stripped uppers are expensive, but they work.
Bill
July 23, 2023, 07:45 PM
AUTiger89
I'm looking at an MCX upper with an Aero lower. I have the adapter kit to make the MCX upper work with normal AR lowers.
If that combination doesn't work, I'll pair an Aero upper with the Aero lower.