16" 300 BLK barrel with pistol length gas system?

RuralRifleGuy · Nov 12, 2018

I have 7.5" and 10.5" 300 BLK uppers for my AR pistol. After shooting both I hate the 10.5". Hate might be a strong word, maybe it would be great if I went the SBR route but it's not something I want to do right now. So I'm thinking of just buying a 16" barrel for it and building it out as a rifle with it's own dedicated lower.

While looking at barrels I've noticed some have pistol length gas systems which seemed odd to me considering I've never seen that on any other caliber for a 16" barrel. After searching here a bit I can find information about pistol length gas systems being the best option for 300 BLK, but it's all talking about shorter barrels.

Would a 16" barrel with a pistol length gas system work or am I better off getting one with a carbine length gas system?

Gas tubes are cheap so I have no problem buying another one, but if there's a good reason to consider a pistol length system on a 16" barrel for this caliber I want to know it.

clandestine · Nov 12, 2018

Do you plan to shoot subs? If so it will likely have cycling problems with carbine gas with subs.

freebird · Nov 12, 2018

And if you don't shoot subs, you're missing some of the fun.

RuralRifleGuy · Nov 12, 2018

clandestine said:
Do you plan to shoot subs? If so it will likely have cycling problems with carbine gas with subs.

freebird said:
And if you don't shoot subs, you're missing some of the fun.

I can't definitively say no. While I don't plan to suppress it I do plan to suppress the 7.5" pistol and I'm more likely to buy or reload one specific load instead of multiples.

So pistol length on any size 300 BLK barrel is the way to go if I may shoot subs?

clandestine · Nov 12, 2018

RuralRifleGuy said:
I can't definitively say no. While I don't plan to suppress it I do plan to suppress the 7.5" pistol and I'm more likely to buy or reload one specific load instead of multiples.

So pistol length on any size 300 BLK barrel is the way to go if I may shoot subs?

Yes, Pistol Gas is the way to go for a .300 all the time.

I can tune a .300 carbine gas to run on subs but it takes a full relaibility job, port work, and a tubb .300 flatwore spring.

DaemonAssassin · Nov 12, 2018

OP, go to KAK Industry and get their 16" 300BLK Value Line barrel for $100. 1:8 twist, pistol gas, melonited, etc...

OLM-Medic · Nov 13, 2018

Why the hate for 10.5"? They say .300 doesn't really benefit much past 9" of barrel anyway.

RuralRifleGuy · Nov 13, 2018

OLM-Medic said:
Why the hate for 10.5"?

It just doesn’t seem as fun to shoot as the 7.5”. I bought it thinking that it would be the perfect length to achieve a certain look when suppressed. It looks exactly as I planned with the KX3 muzzle device, works fine, but by the time I suppress it it will reach nearly carbine lengths. It’s also front heavy and I’m a terrible judge of measurements when trying to envision how something will look, so it seemed like a good middle ground for length at the time.

I was thinking ~$100 for a longer barrel and turning it into an carbine would balance out the weight. I see myself reaching for the 7.5” in every situation. It’s the perfect size for home defense and fun as hell at the range. The way my house is laid out the 10.5” would have to be lowered to navigate my hallway into/out of any room.

OLM-Medic · Nov 13, 2018

RuralRifleGuy said:
It just doesn’t seem as fun to shoot as the 7.5”. I bought it thinking that it would be the perfect length to achieve a certain look when suppressed. It looks exactly as I planned with the KX3 muzzle device, works fine, but by the time I suppress it it will reach nearly carbine lengths. It’s also front heavy and I’m a terrible judge of measurements when trying to envision how something will look, so it seemed like a good middle ground for length at the time.

I was thinking ~$100 for a longer barrel and turning it into an carbine would balance out the weight. I see myself reaching for the 7.5” in every situation. It’s the perfect size for home defense and fun as hell at the range. The way my house is laid out the 10.5” would have to be lowered to navigate my hallway into/out of any room.

Well why don't you repurpose it?

Put a scope on it and turn it into a quiet 220gr subsonic lead slinger. Leave the 7.5" for up close work.

16" 300 BLK barrel with pistol length gas system?

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