Ideal 300 Blackout Barrel Length for HD Pistol that will eventually be Suppressed?

[MeanStreaker]

I'm building my first .300 blackout... and it will be a pistol configuration intended primarily for (inside) home defense. Other than fun plinking and a lot of training, it could be pressed into service outside checking on a bump in the night around our five acres, but I'd likely grab another carbine if I knew I were heading outside.

Eventually it will be suppressed, but that will come later.

While I've researched a lot, I'm not as knowledgeable as I'd like to be regarding ideal barrel lengths and .300 ballistics for this purpose, also considering added length of a suppressor someday inside a tight hallway.

To put my biases on the table, I'm strongly leaning towards a BCM 9" unless someone can talk me out of it with data I'm ignorant about.

Thanks!

[Benito]

I'm building my first .300 blackout... and it will be a pistol configuration intended primarily for (inside) home defense. Other than fun plinking and a lot of training, it could be pressed into service outside checking on a bump in the night around our five acres, but I'd likely grab another carbine if I knew I were heading outside.

Eventually it will be suppressed, but that will come later.

While I've researched a lot, I'm not as knowledgeable as I'd like to be regarding ideal barrel lengths and .300 ballistics for this purpose, also considering added length of a suppressor someday inside a tight hallway.

To put my biases on the table, I'm strongly leaning towards a BCM 9" unless someone can talk me out of it with data I'm ignorant about.

Thanks!

BCM 9" is good. Noveske makes an 8.5" (used to be an 8.2"), Ballistic Advantage makes something in that range as well. Some good options in the 8"-9" range.

[daniel87]

Im happy with my 9 inch aac upper

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[waffentomas]

I went with a 12". Since I hand load, I wanted the versatility of a slightly longer barrel. The longer dwell time allows me to use slightly slower burning powders and heavy bullets. I have more options to adjust powder levels and velocity. Plus, muzzle flash can be manipulated as well.

[CanineCombatives]

8", 8.5" and 9"

[ExplorinInTheWoods]

What length will your suppressor be? If you're getting a 7-8 inch suppressor try going shorter on the barrel like noveske 8.5

[Clint]

IMO, anywhere from 7.5" to 9" is be fine, with a preference toward the shorter end.

[AFshirt]

I use a 1:7 twist 8 inch barrel from law guns. Works well

[themonk]

I dont know if AAC is making uppers anymore so if I was going to buy an upper it would be a KAC, BCM, or Noveske which will all be around 9" or over. I personally see no need to go over 9" At the end of the day the minimum barrel length will be determined by the warranty of your suppressor. Most suppressors warranty 8-9". The AAC SDN6 which I would not recommend buying except for a few specific use cases warranty is for 7.5"

So I know it's at the back of the list but if you want to go short you need to put some thought into what suppressor you want to use.

The easy purchase is a BCM 9" upper. I dont have any personal experience with them but the 4 that I know for sure that will function all four ways is AAC, BCM, KAC, and Noveske. A lot of barrel makes do no R&D and think it's all good with a 1in8 barrel that does not have the proper gas port. I would only buy a 1in7 twist and make sure it runs all four ways - suppressed/subs, suppressed/supers, unsuppressed/subs, unsuppressed/supers. If you are going custom I would go a 1in6 twist if going under 9".

[backpacker]

8" noveske barrel if you build your own upper.
Otherwise just buy a factory BCM 9" upper. Great uppers and come with BCG for like $700.