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Perfect. Thank you. Seems to me, since we have the word "and" in there, we can have a pistol grip firearm with less than 18" barrel, as long as it is 26"
Ummmm, I wouldn't be signing up to be the test case on that one.
Your barrel better be 18" from the breach face and no configuration shorter than 26" overall.
If you have a receiver 7" with a 18" barrel attached you would be in violation of the 26" rule by an inch.
You would need a barrel at least 19" to be in compliance.