Originally Posted by 99monguse
What is the standard length A2 style barrel? I just got my firearm and I want to change the hand guards to ones with rails. Do I just take my existing ones off and measure the length or measure the barrel length?
Barrel length and gas system length are 2 different animals. A standard A2 style AR would have a 20" barrel with a rifle length, 12" gas system but that doesn't mean you have that.
Gas system are generally described as rifle length 12", mid length 9" and carbine length 7". Standard handguards that require the delta ring and hand guard cap will need to fit the gas system length...free float hand guards with a low profile gas block do not, that is you can mount a 13" handguard on a carbine gas system if the tube fits over the gas block.
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