One thing I'm confused about? Why do you need the Accuwasher kit for this muzzle device? Doesn't it come with a crush washer? That's what I've always used and never had a problem.
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One thing I'm confused about? Why do you need the Accuwasher kit for this muzzle device? Doesn't it come with a crush washer? That's what I've always used and never had a problem.
I pretty much agree with you for the .308 versions of these devices too. It's kind of a wash between the FSC30 and 7.62 Flash comp for me with the BABC and MAMS noticeably worse. The MAMS does reduce the recoil a bit over the others due to the angled ports, but still doesn't reduce it anywhere near a cooley brake.
The FSC30 and FC both control the muzzle better (stays flatter with less climb), but you feel a bit more recoil in your shoulder. I have to re-look over my notes on the concussive blast, but IIRC the observer (10ft away to the side of the shooter) noted that the MAMS felt worse than the FSC30 and FC although the SPL measurements were all within 2.5dBA of each other.
What was your host 7.62 platform?
I haven't seen any of the 5/8" thread MAMS ship yet, only the 3/4" thread.
On the 3/4" thread EMC/ECC, there's not a lot of muzzle device choices. I have tried a few, but nothing comes close to the MAMS in recoil reduction and muzzle stability without a huge increase in flash and concussion. This has been verified with AB39, M118LR, BH 175, GM308M2, GM762M2, and many others.
On the 5.56 side.. BCs dip and spit some fire, enough so that I wouldn't recommend it for barrels under 18". The Griffin FC needs some more refining, time will tell. The FSC line blast can be damn intense around walls and barricades. 3Ts dip the barrel noticeably on 12.5" and shorter and spit some fire. Dunno on the Aero Precision yet? The MAMS works damn well in most lengths, though I would not go shorter than 11.5", which is kind've questionable anyway. There's a lot of combo devices out there in the market now, they all compromise in different ways. Switching barrel lengths and ammo can make drastic effects on their performance.
LMT MWS 16" CL, standard M80 ball used. Rounds fired in slow single shots and a rapid group. MAMS was acquired from Boltcarrier.com. They had a bunch of 5/8"-24 MAMS in stock in Dec (and currently have more 3/4"-24 in stock now).
Doing more testing tomorrow which will lead to a video comparison. Devices testing: LMT A2 style, Griffin Armament 7.62 Flash Comp, Bad Ass Battle Comp, PWS FSC30, Knight's MAMS, and JP Cooley.
The MAMS is still a good and noticeable improvement over the stock A2, however it also doesn't stand out above any of the other devices tested as far as muzzle control goes thus far. I have nothing against the MAMS, and in fact I should be trying to convince myself it performed better since I paid for it, but these are our findings so far.
That LMT 16" MWS with LC M80 cycles stoutly I've found. You might want to pop in a heavier buffer to make sure you're not trying to compensate with a muzzle device for the buffer bottoming out hard in the RE, or just try some other ammo like BH175 or GM762M2.
Take this comment with a grain of salt because I've never fired a rifle with one but from the research I've done, it seems as if the MAMS isn't really worth the premium. Other devices can do better in some areas and come close in others.
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I don't really care for the BC or the BCM Comp. The BC forces the muzzle down and the BCM tries to hard to be a flash suppressor. I found that the BCM performed only slightly better than an A2 when it came to keeping the muzzle flat.
I never used a GA Flash Comp but I've heard very good things about them.
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We think the accuwasher is because the tolerance IS SUPER TIGHT...not sure yet, but that's the only thing that makes sense I think (I didn't know crush washers could mess with alignment--is that why they void warranties?).
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Having come from a long line of SF MB556s, I was surprised at how much I liked the BCM compmod (it was on a 16" middy--and I'm used to a 14.5" carbine length gas 6920). I felt it did a great job, but then, I didn't get a chance to really ring it out.
The FSC556 on my first 16" seemed to need to be tuned a bit--it seemed to lift a tiny bit up towards 1:30o'clock after shots. BUT the FSC47 (whatever it's called) on my Arsenal SGL21 was AMAZING!! I remember shooting nice groups at 100Y fairly quickly.
I was about to get a BCM compmod1 (or MAYBE a Griffin M4SDII) on the next 14.5" upper I buy, but I'm waiting for MORE of these AFAB-mini reviews, since it looks very good. The BCM is the cheapest option, but since it's permanent, I'm fine spending however much it takes for me to get what I think is the best hybrid (who knows what might get announced at SHOT).
I know that crush washers do not always supply uniform pressure on the back shoulder of a given muzzle device....which is why they are virtually never used for suppressor mounts.
The accuwasher is a single piece of steel that has been heat treated and does not "crush". It's supposed to maintain near perfect concentricity with the bore and i can see how it would be more effective at doing so than a crush washer.
Is it the only way to skin a cat? Nope. But I'm not sorry i paid for the system.
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I'm sure any number of shim kits (that don't crush) would work just as well. Crush washers might not work due to the size of the exit aperture being smaller than average. Because very few barrel threads are truly concentric to the bore, using a crush washer could add a tolerance stack that could result in a baffle strike in a can or a blast face/exit aperture strike in a longer muzzle device like the AFAB if that muzzle device has a small exit aperture.
The AFAB has a noticeable smaller exit aperture than my FSC556. I don't currently have a set of calipers to estimate the difference, but it is readily apparent to the eyeball. The FSC looks like it might clear a .30 caliber projectile. The AFAB is only ever-so-slightly bigger than a .224 projectile.
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I ran two agency qual courses today (one for irons, the other for optics). 21 rounds each from the 25, 50, 75, & 100 yard line. AFAB worked as advertised. It's definitely better at reducing recoil than the BC. No muzzle dip using m193 unless i was magazine-monopod prone and didn't touch the fore end of the gun with my support hand. Normal prone, seated, and standing produced no muzzle dip.
Gonna have to shoot it back to back with my FSC to judge muzzle stability during rapid fire strings. Very little wobble on target like with a BCM comp. Still impressed.
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