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Posted: 6/1/2014 5:23:21 PM EDT
Okay, I'm ordering a 16" stainless black 300 blk barrel, an assembled upper receiver along with the bcg all from SOTA arms, now here's my question.. Am I better off buying a carbine length gas system or a pistol length? And can I just use a standard low pro gas block with either one? And I have no intention of having a "can." I really have no clue what the difference is between the subsonic and supersonic rounds but I would just like to be able to shoot anything that says 300 blackout on the box.  
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Quoted:
There's little reason to go 300 blackout if you don't ever intend to run it suppressed. The sole reason I can think of would be running supersonic ammo for hunting. 300 blackout shines in shorts barrels and suppressed. That's what I use it for and it is awesome. As for the gas system, SOTAs 16" versions have a Carbine gas port already. My SOTA barrel (16") runs great with a standard Carbine buffer as well. edit: yes, a lopro gas block will work if you do a free float tube. |
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Quoted:
I would just like to be able to shoot anything that says 300 blackout on the box. Will a 16 inch barrel with carbine gas tube cycle properly with subsonics without a can? If he is going with that setup, doesn't he need to shot ONLY supersonic ammo? IE no suppressor equals not enough gas back pressure with subsonics to reliably cycle the bolt every time (especially those subsonics not right on the edge of being supersonic). And if not using a suppressor, why even bother with subsonic rounds in 300BLK. One can buy 220 grain in either so its not like one can buy some bullet weight in Subsonic that you can't buy in Supersonic, both are going to go bang without the can. Isn't a subsonic round through a 16 inch barrel going to have 9 to 11 inches of barrel deceleration contributing to bullet destabilization? Additionally most subsonic's powder loads are burnt in the first 5 to 7 inches (remember this might be a rifle cartridge but 300 BLK is loaded more closely to large caliber pistol rounds in both charge size and burn rate). Factory Supersonic rounds burn their full charge in 10 to 12 inches, from what I know only custom reloading gets to the 14 inch mark. Does anybody make a barrel longer then 18 inches for 300BLK? I can't think of a reason to have a barrel longer then 14 inches other then to not have to file for an SBR. |
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Quoted:
Will a 16 inch barrel with carbine gas tube cycle properly with subsonics without a can? If he is going with that setup, doesn't he need to shot ONLY supersonic ammo? IE no suppressor equals not enough gas back pressure with subsonics to reliably cycle the bolt every time (especially those subsonics not right on the edge of being supersonic). And if not using a suppressor, why even bother with subsonic rounds in 300BLK. One can buy 220 grain in either so its not like one can buy some bullet weight in Subsonic that you can't buy in Supersonic, both are going to go bang without the can. Isn't a subsonic round through a 16 inch barrel going to have 9 to 11 inches of barrel deceleration contributing to bullet destabilization? Additionally most subsonic's powder loads are burnt in the first 5 to 7 inches (remember this might be a rifle cartridge but 300 BLK is loaded more closely to large caliber pistol rounds in both charge size and burn rate). Factory Supersonic rounds burn their full charge in 10 to 12 inches, from what I know only custom reloading gets to the 14 inch mark. Does anybody make a barrel longer then 18 inches for 300BLK? I can't think of a reason to have a barrel longer then 14 inches other then to not have to file for an SBR. Quoted:
Quoted:
I would just like to be able to shoot anything that says 300 blackout on the box. Will a 16 inch barrel with carbine gas tube cycle properly with subsonics without a can? If he is going with that setup, doesn't he need to shot ONLY supersonic ammo? IE no suppressor equals not enough gas back pressure with subsonics to reliably cycle the bolt every time (especially those subsonics not right on the edge of being supersonic). And if not using a suppressor, why even bother with subsonic rounds in 300BLK. One can buy 220 grain in either so its not like one can buy some bullet weight in Subsonic that you can't buy in Supersonic, both are going to go bang without the can. Isn't a subsonic round through a 16 inch barrel going to have 9 to 11 inches of barrel deceleration contributing to bullet destabilization? Additionally most subsonic's powder loads are burnt in the first 5 to 7 inches (remember this might be a rifle cartridge but 300 BLK is loaded more closely to large caliber pistol rounds in both charge size and burn rate). Factory Supersonic rounds burn their full charge in 10 to 12 inches, from what I know only custom reloading gets to the 14 inch mark. Does anybody make a barrel longer then 18 inches for 300BLK? I can't think of a reason to have a barrel longer then 14 inches other then to not have to file for an SBR. Most 300BLK barrels will cycle subs without a suppressor. There are a few like Noveske that will be hit or miss without putting a suppressor on it to cycle subs. It seems you are confusing burn with pressure. It is a major advantage of the 300BLK to burn most of its powder in the first 8 inches as that keeps it from creating a large flash and has a lower report but just because the powder has finished burning does not mean that the pressure behind the bullet is gone. The expanding gas in a subsonic round is still increasing the velocity of the bullet coming out of a 16 inch barrel so there is no slow down happening. It would take some ridiculously long barrel for the pressure behind the bullet to actually be low enough to let the bullet decelerate while in the barrel. I am with you though on why you would want to shoot subs without a suppressor as they are a little quieter than the supers but you still have to wear hearing protection and the supers provide more capability than the subs. |
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Subs are for suppressed use only (they're quieter). You can shoot them non suppressed but there's not really a point
If you're ONLY shooting supers, carbine or pistol will work. Pistol is optimal for suppressed subsonic because of the less gas pressure with the softer round |
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