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I have a factory new sig m400 elite. I am trying to order an adjustable gas block, but im not sure about the right size and fit for my barrel, I cant find any specs online, and there was no markings on the gas block for specifying, should I just get a .750?
 

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If unsure the best way is just to measure the barrel diameter with a set of calipers where the gas block sits. Also keep in mind the other major factor when ordering a gas black is to make sure it will fit under whatever hand guard you have if it goes under the hand guard.. They are not all the same.
 

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Agree with square target2. Both measurements are important. If you don’t know, measure. If you don’t have calipers, buy some; there are numerous available at reasonable prices.
 
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