Adjustable gas block needed?

[Nismo]

I seen this question asked but couldnt find one for my issue. So i plan on getting a barrel with a mid length gas system and the gas port is .078 I plan on using an standard buffer tube and buffer weight. Will i need an adjustable gas block for my barrel?

[VASCAR2]

Only if you plan on using a suppressor. My 18” Group Buy Faxon supposedly has a .076” gas port with a mid length gas system and it runs perfect with the supplied carbine buffer and spring with an A-2 flash hider. I think .078” is close enough to mine you should be gtg or go with a little heavier buffer. If you ever plan on using a suppressor I’d suggest an adjustable gas block, adjustable carrier or carrier key like sold by Rubber City Armory.

[montana]

I seen this question asked but couldnt find one for my issue. So i plan on getting a barrel with a mid length gas system and the gas port is .078 I plan on using an standard buffer tube and buffer weight. Will i need an adjustable gas block for my barrel?

Some AR rifles are more gas efficient than others. Bolt carrier group specs, gas block fit to the barrel journal, gas port size and the ammunition being used all play a part in optimizing the gas system. Most systems will run fine with the factory gas ports since most barrel manufacturers will over size their gas ports to run the spectrum of the different ammunition available on the market albeit being over gassed with the higher pressure loads. The down side to adj gas blocks is the need to perform maintenance on them so carbon lock doesn't occur and they are also less gas efficient "they leak gas" more than a standard gas block. Adj gas blocks should not be used on pistol length 5.56 barrels as they have a tendency to break apart and are not as strong as a standard gas block. It is easier to fix an over gassed rifle than an under-gassed rifle, which may need the gas port enlarged. Remember, an adj gas block can only decrease the gas port pressure, not increase it. If you think the extra cost and maintenance is worth the effort to optimize your recoil, then go for it, otherwise I would stick with a standard gas block. Heavier buffers can help with an over gassed rifle, but the best method is an adj gas block if performing maintenance on them is not a problem...

[Nismo]

Thanks for the insight, i'll go with a normal gas block and see if i have any issues from there. I dont plan on running suppressed any time soon with it and i plan to mainly shoot 123gr rounds