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A barrel can't make a semi auto ar15 into a select fire m4a1.
I never said it did.
The difference in the M4 and the M4A1 is the barrel.
The only hard part to find on the M4A1 is the barrel since it is a heavy barrel under the hand guards, and the M4 is a Gov profile. The A1 barrels arent commercially available.
You can find 3-round burst kits on the Internet.
What is the name of your company?