Thread: Do you need an adjustable gas block when Suppressing an AR?

Hi there,
I want to suppress my Bushmaster AR15 16", ideally with a DPT over barrel unit.
But i understand if i have a stock gas block that i should limit my shooting to <60 rounds per hour...

I would like to stay with the factory front iron sight/gas block.

Is this really a problem, and what will the consequence be if i shoot more rounds, does to much gas get directed to the BCG?

Help, opinions please
...my next AR will have an adjustable gas block :p
Thanks Grant

You can modify your current gas block into an adjustable fairly easy if you have access to a drill press

Gas bust with some high temp silicon... I haven't done mine yet, but will do.

Suppressor use on an AR and Charging Handles - AR15.Com Archive

Love this thread how the same topics keep rolling around and around.

In my experience yes you do need and adjustable gas block, you get sick of the smell of ammonia from the blowback very quick, recoil increases noticeably and rifle is quieter with the gas turned right down. Would do it on an un-supressed AR even
http://www.nzhuntingandshooting.co.n...s-block-14902/

Originally Posted by Beavis

You can modify your current gas block into an adjustable fairly easy if you have access to a drill press

This, cheep and easy

Thanks guys, thanks Ant,
so more gas is directed at the BCG.
whats the concern over shooting more rounds?

...topics on forums always roll around and around, thats whats good about them, things change, things improve, new products...

Originally Posted by grunzter

...topics on forums always roll around and around, thats whats good about them, things change, things improve, new products...

Yeah but my thread was only about 3 weeks old, now it's gone into the dark vault of old forum threads along with a ton of other useful info.

The gas block won't affect the amount of rounds you can shoot/hr, the limiting factor is the temperature of your suppressor. Should be an easy enough mod and well worth it even un-suppressed

cheers, after seeing your link i recall reading this now
will look into the grub scew idea...

Shooting a AR with a can on on will reduce the life of your bolt, if you don't take measures to control the excess energy applied to it. I am Using an H3 counterweight buffer which helps with my 16" Colt but ejection is still a little violent. It's under gassed without the can on though, had a couple of occasions where the bolt didn't fully lock back. I will probably convert the gas block to an adjustable at point as well.

I've never had any issues with mine spitting shit in my face with a suppressor on it.
EDIT: All I've ever done is apply a thin layer of grease to the charging handle where it runs inside the receiver

Probably because your one has a short dwell time to begin with

I have a feeling dpt suppressors arn't rated for for sustained fire forget who told be that someone did it was awhile ago now could have a new model out or something

Alloy suppressors full stop aren't suited to sustained fire. It loses its tensile strength when you get it hot.

yeah that's what it was cheers @Beavis

Originally Posted by Beavis

Alloy suppressors full stop aren't suited to sustained fire. It loses its tensile strength when you get it hot.

Yeah you get a print out with recommendation not to shoot over a certain amount per hour, and half that amount with a neoprene sleeve on