Never heard of someone building a grease gun. And, since the restrictions make them need to be watered-down to agree with regulations, whereas the AR doesn't (16" barrels are common anyway).....
AR-15/M16A1 or M3A1 Grease Gun - for what intended purpose? Easier to help if we know what you want to use it for. Also, how do you propose building the Grease Gun and in what configuration that would be legal?
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