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M4E1 threaded stripped upper rail compatability
Will the Aero Precision threaded M4E1 upper that can accept standard hand guards accept the Giessele mk14 handguard with the anti rotation tabs?
Does this upper offer anything else besides looking cooler than a standard upper?
How do Aero Precision receivers and other products compare to other more expensive options?
Last edited by Skeeter98; 09-11-18 at 01:01.
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