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Gas block


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The only difference is in the bore size of the gas block, for the gas block journal size.  There's some weird ones out there now, with custom shiit, but the common ones are 0.625", 0.750", 0.875" (there's a pattern there, 0.125" apart), and then there's the 0.936".

Gas blocks are gas blocks.  Doesn't matter what AR they go onto.  Depends on the barrel maker.

Gas TUBES between large frame and small frame ARs SHOULD be different, because of height-over-bore between the two platforms.  Different bends between the two, because of height-over-bore.

Problem is, alot of barrel makers spec out an AR15 gas tube length for a Large Frame AR...  it's not a huge deal, but it's still a deal, to deal with...

Check this pic - it should be obvious...


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