I believe "[verb] a few [plural noun]" is a verbal phrase.
It's use will not permit modification of the noun without sounding wrong.
Take a few bites. Have a few beers. Watch a few movies. Here few is referring to some or a sampling of. You could make it sound wrong on purpose by welcoming a friend with the non-generous offer "Here, have a few beer!"
You can modify the plural noun by referring to the members as a collection.
Not "Take a few of sandwiches" but "Take a few of these sandwiches" or "Take a few of the sandwiches I brought"
You will see the use of a few used differently as in "A few of these will be perfect", "A few of the guys would enjoy lunch." or "A few of the shoes need replacement."
Here A few is safely away from the verb phrase. Being used to seeing of here makes one wonder why it's missing in the other.