Ar15 7.5 & 10.3 inch uppers

Early summer you say I do hope that you still have some available when I get out of the funk I'll be putting myself in financially, because I've been waiting specifically for your uppers.
 
Not to derail but i have a question. I currently have a 14.5 and want one of the 10.5 uppers. Will the 4 inch difference require any tuning to modify timing or anything for the gas block? I read somewhere that going shorter does but don't recall the threshold when that would occur.

The gas system is contained in the complete upper. Just swap uppers.
 
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