AR10 gas block question

ilikegunspdx · Oct 11, 2022

Need to order a barrel for an AR10 and was wondering what the pros and cons are to have a pinned one vs adjustable one. I assume the adjustable one is better and there is no benefit to having it pinned? Don't know much about it. Thanks for any advice. I'm looking for best quality/performance option, not least expensive that will do the job.

Here are the two options:

solv3nt · Oct 11, 2022

Pinned is one thing, and adjustable is something different. Adjustable allows for user gas adjustments to tailor a load to the appropriate cycling. Pinned is the act of drilling a hole in the barrel and installing a roll pin to hold it in place. The alternative is to use a set screw in a divot.

titsonritz · Oct 11, 2022

They are two different thing so it depends on your usage and requirements. An adjustable gas restricts gas flow which can be useful for an oversize gas port issue or suppressor use to help lesson back pressure. Personally I consider them another potential failure point or at minimum a high maintenance item. An adjustable gas block can also be pinned. A pinned gas block is a bomb proof method of installing a gas block or FSB and is a requirement by the military.