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Posted: 11/10/2012 11:04:24 PM EDT
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Hello all. I was pretty set on going with the sdn6 for my 5.56 sbr and future 300 blk sbr as well. Now I am undecided... I was originally going to go with the noveske light shorty switchblock upper. Now I am debating going with a factory DD MK18 instead. I was not sure if the mk18 will work with an aac 762sdn6 without shimming to clear the rail, plus the mk18 is not switchblocked. Apparently it should work with the blackout or brakeout mount. Is it a sure bet it will work without shimming, I really dont want to have to rig it to make it work an have too much shims... Im having a hard time figuring out if I should go switchblock route. I plan on running suppressed most of the time, I would like to be able to run unsurpressed at times as well.
Is it really worth it to run a SB on a suppressed sbr? I want an sbr that will run without a hiccup, also the least amount of wear an tear as possible. What should I consider deciding between the MK18 vs the Noveske SB upper? I also handled a mk18 with a gemtech suppressor. I really like the bi-lock qd feature on the gemtech. But I hear SDN6 is where its at, especially for an sbr with the can design... I have also heard of aac cans backing off and causing end cap strikes and worse baffle strikes becaus of that. What are the benifits, disadvantages, issues with going one way or the other? Im really torn between both upper set ups and suppressor options. Im on limited time frame as I need to order an upper before it gets hectic with people going on a buying frenzy right now. My form 1 has been pending for 3 months. I want to make sure I am set for when my lower is approved. All info is welcomed! Thank you! |
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I like the Gemtech QD system; it is robust and goof-proof. If there is a downside, it is that the clearances are very tight, so the mounts must be cleaned regularly (~200 rounds). I have read that some people have issues with the ratchet teeth on AAC cans wearing quickly if not handled properly, but do not have any personal experience with those. |
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Another option is you can get my Patent Pending, modular, tool-less, adjustable gas block and it will work with a MK18 rail.
This gas block also uses a standard unmodified gas tube. Most 10.3" barrels are overgassed. Crane specifications for a 10.3" barrel is .070". The DD 10.3 I bought brand new came with a port a little over .078" and is way over-gassed. If you do not regulate the gas, it is going to cycle much faster, have higher recoil, higher parts wear and of course gas in the face. I've got videos on my site demonstrating all of this. I don't have a video of the 10.3. but I did test it. It was about 200 RPM faster suppressed if you don't regulate it. Similar to the results I obtained with the 14.5". When regulated, it shoots slower than unsuppressed due to the increased dwell time. I have tested with a .070" regulator plate and it works perfectly unsuppressed with that size just like Crane specified. I tested using M193 and M855. I use .046" for the suppressed position. Every Govnah gas block comes with two regulator plates. The other plate is for weaker ammo or heavier buffer. This 'extra gas' plate for weaker ammo I spec'd out to be .073" for unsuppressed and .052" for suppressed. Below is a pic from the installation page on my website where I have some pics specific to the Mk18. You can see the regulator plate in the 3rd ventilation hole from the muzzle. Just use a bullet to push it to change position. Plenty more information and pics at http://micromoa.com 
Let me know if you have any questions. |
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