JD Machine?

[monty732]

Has anybody used the JD machine aluminum gas block on their 450?

[Siringo]

No -- but is there any concern of increased gas erosion within the block -- over steel?

[monty732]

That was my concern.

[Siringo]

Nice looking stuff. Not only am I concerned about erosion, the expansion ratios of steel and aluminum are quite different. Would there be a chance the aluminum variety would loosen up??

I use free float tubes that cover the gas block -- so I want something that will not rust. So -- I found low profile gas blocks that are made of stainless.

I like the look of their uppers. Seem like a mix of Mega Machine designs.