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Posted: 12/11/2014 7:20:13 PM EDT
| Just bought my first suppressor, really excited. My rifles shoot 100% all the time every time. Is an adjustable gas block required when running a suppressor? Or will I just have some hot gas blow back in my face? Suppressor will be going on a 18" Noveske 5.56, and a 10.2" Noveske 300 blackout . |
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For semi-auto I would say they are not required. They fall into the more of a "nice to have". If the extra gas doesnt bother you than dont bother with the complication of an adjustible block.
For full-auto I would say they trend more toward required. It really depends upon the gun. Can you set up a gun to run with a can without an adjustible gas block....sure. Will the gas to the face be even worse than in semi...yes it will, will the cyclic rate speed up...yes it will again. I dont really like to run any of my M16s with a suppressor without an adjustible block. Sure they will run without it, but it makes shooting them much more enjoyable. If you do end up getting an adjustible gas block, I really like the MicroMOA version (in no way affilliated with the company) vs. any of the set screw types I have used over the years |
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Thanks for the replys! I'm going to leave it as is for now and when the can gets out of jail shoot them and see whats what. I'm not sure how it will be on your 18" 5.56, but on my 10.5" it was annoying after a few rounds to be suffocating on gas. I got the MicroMOA. |
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This is discussed at length here: http://www.ar15.com/forums/t_6_51/434141_Any_kind_of_tuning_needed_for_reliable_SBR_.html |
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Well I did not have one and my system was already over gassed. With the can on it was really bad to the point it just stupid and more than likely damaging the firearm. The adjustable gas block is cheaper than the quick attach mounts so I figured wth. Its not needed but wow the difference changes that perception. Its like the argument that a can isn't needed. It just makes shooting more enjoyable.
If you get one you won't hate it. Honestly if you like being able to have minimal recoil / gas to the face/ controlled casing ejection then get one. Otherwise shoot it without the adjustable gas block first and then decide if you want something better. Its not hard to swap a gas block. |
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I don't shoot 223 in my 556 guns. I don't shoot 222 either, for basically similar reasons. Quoted:
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If you have the right port and buffer it isn't needed. And never change what ammo/load you use. I don't shoot 223 in my 556 guns. I don't shoot 222 either, for basically similar reasons. M193 and Mk262 behave differently. |
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I'm not sure how it will be on your 18" 5.56, but on my 10.5" it was annoying after a few rounds to be suffocating on gas. I got the MicroMOA. Quoted:
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Thanks for the replys! I'm going to leave it as is for now and when the can gets out of jail shoot them and see whats what. I'm not sure how it will be on your 18" 5.56, but on my 10.5" it was annoying after a few rounds to be suffocating on gas. I got the MicroMOA. My 16" isn't too bad but like you, my 10.5" was unbearable after a few rounds. I also went with the Micro MOA. |
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I have a 10.3" BLK bbl with a PRI adjustable gas block. I am using a Gemtech Quicksand suppressor.
With my 125gr supersonic hunting loads, I turn the gas adjustment screw 1 turn out from closed and get 4 o'clock ejection without a suppressor. With a suppressor and either my supersonic hunting loads or 220gr subsonic loads, I have to have the gas screw 1/2 turn out from closed to get the same ejection direction. In other words, not a lot of difference. Based on the above, why have an adjustable gas block. However, I also shoot some lightweight bullets with milder powder charges unsuppressed. For those I have to turn out the adjustment screw 3 whole turns from closed. So, for me the adjustable gas block works. I have a SIG 516 10" 5.56 upper. With the gas set on minimum, it won't properly function w/o a suppressor. For that, set the gas on normal. With a suppressor it functions fine on minimum gas. I do feel letting as little gas as possible into the action keeps it cleaner. |
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