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Thread: Aero M5 issue. Suggestions?
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8 May 2020, 11:03 #1
Aero M5 issue. Suggestions?
Specs; Aero .308 upper/lower/parts kit, Faxon 18” pencil bbl - rifle gas, adjustable gas block, Lantac E-BCG (black nitride), RE10 extension w/extra power spring and H3 buffer.
No problems suppressed with AGB closed down several clicks. W/O can bolt will lock back but not eject the case. Pulls from chamber and lies loose in upper even with gasblock fully open.
I’ll try swapping the BCG from my factory 16” mid-gas MI gun that runs well both ways. Any other ideas to try? Could the extra venting of the enhanced bcg require a different weight buffer? I’m fine with making this a dedicated suppressed rifle if need be.“ The aim of totalitarian education has never been to instill convictions but to destroy the capacity to form any.” ― Hannah Arendt
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8 May 2020, 12:10 #2
I’d try a lighter buffer and/or lighter spring. Sounds like you’re stacking up the tension to limit operation. Try the other BCG too but I doubt that’s the issue.
I had a similar issue with a 308 BA barrel. Wide open gas block, light buffer, and it still wouldn’t cycle unsuppressed. I sent the barrel back to BA and they opened up the port.
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8 May 2020, 12:29 #3
Thanks Fledge. I’ll try the spring/buffer first as I have spares.
“ The aim of totalitarian education has never been to instill convictions but to destroy the capacity to form any.” ― Hannah Arendt
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8 May 2020, 16:15 #4
I agree with Fledge - the first think I'd do is drop that extra-power spring.
Also, which ammo? My limited experience suggests that when you are on the edge of having a tuned system there is a pretty big difference between commercial .308 vs milsurp 7.62, which the latter being comparatively underpowered.
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8 May 2020, 17:23 #5
Single or double extractor?
Try with or without insert or different spring maybe
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8 May 2020, 20:35 #6
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8 May 2020, 20:43 #7
I had an extractor spring issue with a 6.8 SPC build, but the problem was not releasing the case which is not the case here. Doubt the super expensive bolt design is at fault.
I was using the long orange EP spring,and now,I see people saying the shorter red sprinco is correct with the RE 10. So much mis-information out there. I will try different combinations of springs/buffers and report back.“ The aim of totalitarian education has never been to instill convictions but to destroy the capacity to form any.” ― Hannah Arendt
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8 May 2020, 20:46 #8
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8 May 2020, 21:01 #9
Amazing! At 71 I still learn new things daily.
“ The aim of totalitarian education has never been to instill convictions but to destroy the capacity to form any.” ― Hannah Arendt
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9 May 2020, 02:00 #10
Ok, read to fast, seen your using a Lantac
I see you have a good idea of what’s going on.
Also , something I always check now and shim if needed.
How much clearance between your bolt and bolt catch when you rack it all the way back? Good rule of thumb is about a nickel worth of gap. I always shrink mine a hair. But not too much..
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10 May 2020, 22:56 #11
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11 May 2020, 01:24 #12
Stang. Bolt catch clearance is good.
Boiler. Yes, I saw Sprinco says red spring for the RE10. Somewhere else said use the orange which I had installed. Hopefully the red cures the problem. Might be a couple weeks before I get back to the range to test.
Thanks everyone for chiming in.“ The aim of totalitarian education has never been to instill convictions but to destroy the capacity to form any.” ― Hannah Arendt
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11 May 2020, 08:00 #13
I'll also add that since you have an AGB you might end up being happier with the Armalite EA1095 spring instead of the Springco Extra Power spring, especially if you normally shoot 7.62x51. The main advantage of an AGB is you can tune your gas so you don't need a stronger spring in the first place.
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11 May 2020, 11:34 #14
I just installed 2 Orange Springs into my 12.5 308 SBR and a 16" 308, both Aero M5's.
Still waiting on the PD range to open so I can see if they run better. Not any issues right now, but I know the Orange Spring is recommended if you're using an AR15 length receiver extension. I'd use the 308 buffer instead of the H3 to start.
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11 May 2020, 12:06 #15
Isn't the 308 buffer the short stubby one? If so, that should only be used in the AR15 carbine length buffer tubes as those are too short for the AR10/A5 extensions. I made the mistake once of running a 308 buffer in a AR10 extension and ended up damaging the threads on the rear of the lower receiver from bcg over travel.
That said, in principle I think you are right as the .308 buffer is about the same weight as an H buffer, so I'd probably start with an H instead of the H3.