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Old 03-20-2017, 08:48 AM   #1
savin yours
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Default Rookie AR question

I'm in the early stages of building an AR in 300blk and I'm wondering. Is there anything I can do/add to I so it will cycle subs? Is there a better caliber for good cycling subsonic rounds? Wasn't sure how to search for this question.


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Old 03-20-2017, 09:10 AM   #2
TexasAggieB
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16in barrel? Or pistol length?
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Old 03-20-2017, 09:16 AM   #3
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Quote:
Originally Posted by savin yours View Post
I'm in the early stages of building an AR in 300blk and I'm wondering. Is there anything I can do/add to I so it will cycle subs? Is there a better caliber for good cycling subsonic rounds? Wasn't sure how to search for this question.


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Adjustable gas block with gas hole large enough for subsonics.
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Old 03-20-2017, 09:25 AM   #4
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16in barrel? Or pistol length?


Sorry, SBR Probly around 11". I don't see me ever shooting without the can.


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Old 03-20-2017, 09:44 AM   #5
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Adjustable gas block
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Old 03-20-2017, 11:00 AM   #6
Mike D
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Make sure to get a pistol length gas system.


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Old 03-20-2017, 12:48 PM   #7
Zen Archery
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Reload Kit.
My experience playing with Subs they load them too close to the sound barrier and depending on temperature/elevation you will occasionally get a crack.
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Old 03-20-2017, 12:53 PM   #8
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pistol length gas and you'll be good, my 10.5 sbr cycles subs just fine
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Old 03-20-2017, 01:09 PM   #9
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I'm looking to do something similar. Would be interested in seeing a post on the build
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Old 03-20-2017, 01:32 PM   #10
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Thanks guys. Any other tips or must haves?


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Old 03-20-2017, 03:27 PM   #11
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Quote:
Originally Posted by savin yours View Post
Sorry, SBR Probly around 11". I don't see me ever shooting without the can.


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I think the can provides additional back pressure which helps cycling subs. I think the barrel gas port needs to be bigger to cycle subs generally, but this can be offset (potentially) by using an adjustable gas block and a carbine weight buffer.

I didn't know any better when I built mine, but it cycled fine so far. I have an 8.5" barrel with a 0.075 gas port, adjustable gas block set to almost closed, and a carbine weight buffer. Cycled supersonics great without much recoil with a suppressor. Have not tried subs yet but I'm hoping I can just open the gas block more to get it to cycle. Going to give it a few hundred rounds of supers first to let everything settle in.

Www.300blktalk.com is also helpful
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Old 03-22-2017, 01:45 PM   #12
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my experience... build it 8.5". you'll be able to make your loads a little higher powder loads, which increases the consistency of cycling subsonic rounds.
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Old 03-22-2017, 02:11 PM   #13
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my experience... build it 8.5". you'll be able to make your loads a little higher powder loads, which increases the consistency of cycling subsonic rounds.


Yea, that's sounds good to me. My can is about 7.5"


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Old 03-22-2017, 03:14 PM   #14
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I have a 9" with pistol length gas tube and a heavy buffer spring. It shoots supers with or without the can just fine and subs with the can. Subs without the can are a little hit or miss on function but when shooting subs it will always have the can on it so no need for an adjustable gas block for me.
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Old 03-22-2017, 03:47 PM   #15
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Quote:
Originally Posted by Mike D View Post
Make sure to get a pistol length gas system.
^^^ This and you shouldn't have any problems. The 300blk was designed to be shot suppressed from short barrels. I don't think I've ever had a FTF or FTE while shooting subs from any of my 300 blk setups.
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Old 03-22-2017, 11:06 PM   #16
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Quote:
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Make sure to get a pistol length gas system.


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^^This^^

No need for an adjustable gas block on a 300blk with a pistol length gas system - especially with a can. Can't imagine even owning a SBR unless you're shooting suppressed.


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Old 03-23-2017, 02:30 PM   #17
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As stated above, pistol length gas system with a can there is no need for adjustable gas block that I've seen. You are welcome to use my upper this weekend if you want to try it out. It is a 7.5" (Have a 10" also but I like the 7.5 better).
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Old 03-23-2017, 02:48 PM   #18
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Quote:
Originally Posted by Dejashoot View Post
As stated above, pistol length gas system with a can there is no need for adjustable gas block that I've seen. You are welcome to use my upper this weekend if you want to try it out. It is a 7.5" (Have a 10" also but I like the 7.5 better).


I might take you up on that!


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