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Thread: Griffin Armament M4-SD II

  1. #21
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    Quote Originally Posted by quillbro View Post
    The M4SD is a legacy product that will no longer be manufactured.

    However it did help in developing the M4SDII. The original M4SD was based off of prior design from the Spartan and Spartan II, but incorporated a fast attach mechanism which has since evolved even further on the M4SDII.

    The M4SD was made of 4130 and had 17-4 baffles.

    The only shared feature the new M4SD II has with the older model is the similar mounting system, but even that has been improved significantly. The outer suppressor body is aesthetically pleasing due to being OD Ground on centers after being fully Tig welded with comprehensive weldments throughout. It has a 316L tube, rear mount, and end cap and has a full 718 Incolnel baffle stack as well as wire EDM'd Fast attach geometry and a wire EDM'd bore. Even though we are a smaller company than the major players in the market this can competes with the best of them. It also gains the ability to be used in conjunction with any of the 4 M4SD muzzle devices as well as a standard A2 birdcage. We HIGHLY recommend that the suppressor only be mounted to muzzle devices that are using shims vs crush washers. It has a fairly liberal bore diameter at .311 at the front cap but A2 FH's have a wide tolerance range.

    The M4SDII also reduces sound impulse by 34db which places it amongst the top performers in the industry. We are excited to bring it to market after years of development and are anticipating this as a successful product for years to come.

    In short.... yes it is better than the M4SD, and as soon as we can make the web revisions the M4SD will be no more.

    We are also coming out with a shorter version of the M4SDII (M4SDK) to compete with some of the new shorter cans. This will be released ~end of Q1 2013.



    I was just talking with Austin about this can over on ARF. Sounds awesome

  2. #22
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    Anyone know if the M4SD (ii)k are compatible with the Daniel Defense flash hiders?

  3. #23
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    I have one in NFA jail. If I get the chance I'll see if it fits the DD hider.

  4. #24
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    Here's a Review I did of my Griffin Armament M4SDK on AR15
    http://www.ar15.com/forums/t_6_20/43...pressions.html


    Backstory
    I've been talking to Austin from Griffin Armament for about the last year or so; mainly industry talk and whatnot. Back when the M4SD was on the market and the M4SDII was just launched I mentioned my interest in a smaller, lighter 5.56 suppressor. He told me me about a future project he was working on called the M4SDII-K.

    So, when the M4SDK was launched we spoke about it briefly and I started saving my pennies and reexamining the other options.

    I wanted to find something smaller and lighter than a typical can for the purpose of reducing concussion on an SBR and reducing recoil and muzzle flash, especially under NV. I didn't feel the need to find a single can that compromised size/weight for the ability to use calibers I may never own.

    The stats looked good:
    Length: 5.75 "
    Weight: 14.5 ounces.

    An M4-2000 is 6.6" and 17.6 ounces
    A Saker is 6.7" and 18 ounces

    Now those are not completely fair comparisons because the M4SDK is billed as a "mini-suppressor" to compete with the Mini-4 (5.25"/13.5 oz) and the SF Mini (5"/14 oz) but it's slightly larger than those. Austin claims a 27db reduction which is less than the of the 32-34db of M4-2K and greater than the 22db of the Mini-4.

    Stat-wise I felt this fit closer to the SF FA556-212, which is exactly the type of can I had been most interested in (6", 16oz, 28db) but Austin was adamant that it was designed to compete with the mini cans.

    When I originally planned to buy a can I was on board the AAC SDN-6 train. I liked the caliber universality, but when I got my hands on it, at 7.6" and 19.85 oz I found it too long and heavy to truly be worth sticking on an SBR. I then had the chance to shoot it on a 16" DDM4 and found it very uncomfortable to shoot with it's very high pitch.

    I began looking at dedicated 5.56 cans, and got lots of expert opinions from guys who's opinion and experience I respect. It came down to a giant list of all the problems with all the major brands and "buy [span style='font-style: italic;']Brand-X[/span] because it sucks but it's the best one going right now". I said screw it and began to ask Austin more questions about his cans.

    The other thing I really liked was the A2 compatible mount. Battle Comp, BCM, Griffin, DD, PWS, and Vltor all make A2 compatible muzzle devices for the AAC Omni and Gemtech HALO (both A2 compatible cans). If I don't want to buy a fancy mount I have A2s coming out my rear. The drawbacks of the A2 is many claim there is a spec issue that requires a larger exit port in order to keep from having endcap strikes. It's AAC's claimed reasoning for dropping the Omni and It's also something I was told by a former AAC engineer.

    I called Griffin, got my can ordered, and had it sent to MAC Tactical in NH (highly recommend).* Waited for my stamp, and a couple days after my son was born got the email my can was out of jail. This was early June and I hadn't had any range time until today.

    *I would recommend Griffin make their markings a bit deeper. They're hard to read with the Cerakote which resulted in a shipping mistake adding time to my delivery.



    Shooting It
    Today I met with my buddy who's an instructor at a local firearms academy. I just won the NH NG TAG match and needed some help with my pistol work before the MAC regionals this next month. After spending the afternoon running handgun drills I pulled out my 11.5" SBR and my new can to wind down.

    This guy was one that had originally warned me against buying an "off-brand" can. He professionally tests suppressors and works as a test engineer in the firearms industry, so I took his input into consideration and ended up ignoring it. He looked at my can, was impressed at the construction and thought the mount was a very cool very simple setup, but was suspicious of the reduction claim due to the size.

    Note: The mount has a couple of degrees of rotation around the bore axis to it due to the tolerances of how the mounts locks on the wrench flats. However, because the collar fits around the diameter of the BFA groove that rotation doesn't add any movement to the can itself.

    We ended up firing 120 rounds in <10 minutes from an 11.5" with a Griffin Flashcomp shooting M855. While not hearing safe, mainly due to the sonic crack, it was incredibly comfortable to shoot. I dumped my first mag without ear pro and didn't feel any discomfort. The sound was much deeper than other cans I've played with in the past, and so while the sound reduction wasn't as great numbers-wise it was much more pleasant on my SBR than, for instance, the above SDN-6 on a 16" bbl. I can't in good conscience say "hearing safe" because I know better (and have moderate tinitus from my last 2 jobs) but it was not uncomfortable to shoot without earpro and wouldn't worry about my hearing in a non-range rifle use situation.

    After firing this can on my rifle my buddy commented how impressed he was with the sound reduction, and especially impressed because of its size. He also agreed on how comfortable it was to shoot and be near the shooter.

    A note on POI shift. I use a 50m zero. I didn't take the take the time to bench the rifle because I was POA/POI at 50 offhand with my first few shots and we were running low on time. I'm sure there's some POI shift, but on my setup it seemed minimal.

    As for the rifle function, I've tuned my SBR to fire ~700RPM without a can (using M855), which is the bottom of the ideal function range. With the can, I'm experiencing a slight function increase, but only by a small amount. The gun has very little recoil and gas blowback wasn't terrible.

    While at some point I'd like to meter the can (which I planned back when I bought it but due to a change in employment have been unable to do) I took some video today. Now, video is completely unrealistic but some people seem to really get a hard-on for youtube silencer videos so I figured I'd take some.

    Overall this is a great can and I'd highly recommend it; especially if you want a smaller 5.56 can but still want decent sound reduction. It's not a do-it-all every caliber can but it's an excellent compromise 5.56 can. I've never been a fan of the "buy a Spec-War 7.62 for your AR15 because one day you may own a .300 MinMag" viewpoint, but this can has really confirmed my preference and recommendation for dedicated task and caliber cans.

    As for "off-brand", I fully believe Griffin is an up-and-comer. I remember hearing about "these new guys Silencerco" and I've seen what new-comers to the market can do. I've also seen Freedom Group cause some damage to AAC and seen what can happen to the monoliths of the industry when they stop innovating.

    Yes, Griffin has had some (deserved) bad press and yes, Austin can come off as abrasive. I've ripped into Austin on here on quite a few occasions if you read back in the archives. However, taking the time to talk to him via PM and seeing his passion for quality suppressors I put his passion for his product into perspective. He made me a great can and I hope they do well.




    http://youtu.be/ZNbkLeNdNB0
    Attached Images Attached Images
    Last edited by TCBA_Joe; 09-04-14 at 08:58.

  5. #25
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    Here's the 2nd video I couldn't attach

    http://youtu.be/2MgE4ilR7SY

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