Quoted:


There are more than a handful of AGBs that don’t utilize small set screws.  The Noveske Switchblock has been around for a while, and there are a few other cheaper options that offer similar features.  Riflespeed just released an AGB with a large adjustment collar that extends over the barrel and out the front of your handguard.  There are a few others similar as well, although they don’t appear to be as well refined.

https://noveske.com/wp-content/uploads/2020/10/05000507-2_1-1-scaled.jpg
https://www.riflespeed.com/assets/images/Carousel%20Images/IMG_2143_LRExp_2400px.jpg

As for an AGB adjustment screw seizing, it really isn’t something I worry about, especially with Superlative B/O blocks.  In B/O mode, I set the gun up to run unsuppressed in a relatively cold environment.  This will mean increased pressure when the temps warm up and you add a can, but you’ve usually tamed enough gas out of the system that you shouldn’t suffer any reliability issues, plus the B/O mode should offer a bit of self regulation as the pressure increases, meaning more gas is being pushed through the B/O port.  This method has so far worked on .308, 6.5C, 6.5G, and 6mm ARC without any issues.

Quoted:

Are there adjustable gas systems that replace the gas tube and work with the standard FSB?

Quoted:
For suppressors and adjustable gas block is best. Yes you an use heavier springs or buffers, but reducing the amount of gas is better.

Quoted:
I found this. Anyone used anything similar?

https://usamade-ar15parts.com/product/adjustable-gas-system/

Pic sucks but it seems to be a valve in the middle of the gas tube
https://usamade-ar15parts.com/wp-content/uploads/2022/06/gas-tube-A--150x150.jpg

Quoted:
Heavier I assume? H3, H4?

Quoted:
Flow through cans are less of an issues for extractors, etc but a 5.56 is basically a 22 so there ain’t much breaking going on regardless.

Quoted:
@thylaughingman

Found this one too. Looks like its made to order

https://www.mountsplus.com/mgi-adjustable-ar-15-carbine-length-gas-tube.html

Quoted:
I've beaten the shit out of my tan/fde SBR, I don't think I've ever actually shot it unsuppressed.

So far, so good.  The cerakote is dark in some places, but there's nothing mechanically wrong with it.  10k? ish rounds now with a Silencerco Specwar can.

Quoted:
@Alex_F

Specwar you say? Have you seen this thread?

https://www.ar15.com/forums/armory/Just-got-the-specwar-upgrade-from-SiCo/20-541830/

Quoted:
@Alex_F

Specwar you say? Have you seen this thread?

https://www.ar15.com/forums/armory/Just-got-the-specwar-upgrade-from-SiCo/20-541830/

Quoted:
There are a bunch of bandaids to deal with the extra gas on an AR.  But the only one that actually addresses the problem is restricting the gas at the port with an adjustable gas block or smaller port.  Or reducing the flow restriction in the suppressor, but that isn’t ideal.  It is however a good option for non adjustable gas systems.

A lot of guys prefer heavier buffers/springs or bootleg gas carriers but all they are doing is managing the extra gas that makes it to the receiver.  Doing so just gives you a gassier and/or louder rifle as you vent more gas next to the shooter’s ear.  Some like “flow through” designs but that is inherently less efficient as the gas spends less time expanding/slowing/cooling to lower the energy which is what needs to happen to lower the report.  You want as much gas to go into the suppressor for as long as possible while limiting the amount that gets sent back to the action to the amount needed for reliable operation.

I think too many people take the approach of throwing shit at a rifle because others told them it is needed or worked for them without thinking about the system as a whole.  Because of that they end up causing more new and exciting problems.  I did the same with an LMT enhanced carrier that wasn’t right for the application I used it for and my rifle wouldn’t run for shit.  The AR gas system is pretty simple, but it is designed to operate with a certain amount of pressure for a certain period of time.  If you add/subtract length after the port you affect the amount of time that pressure is applied (same goes for adding a suppressor).  

What you need is going to be unique to your setup.  A 20” AR can have a nice small gas port and give a gently but longer lasting impulse.  While a 10.5” will have a harder impulse that doesn’t last because of the short dwell time requiring a bigger port to function.  Adding a suppressor to the latter means you increased the time pressure is present for that much larger port, so the best option is to shrink that port a bit as you would with a longer barrel.  While adding a suppressor to a 20” is much less disruptive since the rifle is set up for a longer dwell time by default.

-Mike