“I carry a gun because a cop is too heavy” is a gun rights saying that has been printed on many images. The saying was printed in The Spokesman-Review (Spokane, WA) on August 9, 2007 and probably originated on a bumper sticker.
   
   
Newspapers.com
Newspapers.com (Article continuation.—ed.)
9 August 2007, The Spokesman-Review (Spokane, WA), “Latah sheriff sees safety with more guns” (AP), pg. B6, col. 2:
“I carry a gun because a cop is too heavy.”
(David Klingenberg at a city council meeting.—ed.)
     
Google Groups: news-sarasota
[the_No_Bleep_zone] Profound Thinking!
Mark R Taylor
Nov 20, 2007, 9:45:47 PM
(...)
3. I carry a gun cause a cop is too heavy. (Gotta love this one!!)
 
Google Books 
Greatest Jokes of the Century Book 21
By Thomas F. Shubnell    
Published by author
2008
Pg. 161:
I carry a gun because a cop is too heavy.
   
Twitter
MikeFuryTech
@MikeFuryTech
My favorite answer of the day to someone when asked “why do you carry a gun?”  Answer: “Because a cop is too heavy to carry around with me.”
11:05 AM · Jan 15, 2009·Twitter Web Client
 
IMAO 
Gun Slogans
Posted by Frank J. on 18 May 2009, 12:11 pm
(...)
COMMENTS
Ken
May 18, 2009 at 12:52 PM
Some people just need killin.
I carry a gun because a cop is too heavy.
 
Phys.org
JANUARY 22, 2013
The politics of US gun control: Expert analysis on the fallout from Sandy Hook
by Brianna Goldberg, University of Toronto
(...)
This helps sense of why they define themselves as morally upstanding, responsible citizens in relation, and sometimes against, public law enforcement, often citing statements such as “I carry a gun because a cop is too heavy,” “I don’t dial 911,” and “A gun in the hand is worth two cops on the phone.”
     
Indy Star (Indianapolis, IN)
Sarah Palin, Oliver North headline NRA Stand and Fight rally at Lucas Oil
Kristine Guerra .(JavaScript must be enabled to view this email address)
Published 10:12 p.m. ET Apr. 26, 2014
(...)
She also restated a joke commonly seen in bumper stickers and T-shirts.
 
“Yeah, I carry a gun because a cop is too heavy,” Palin said amid cheers.
 
Google Books
Right to Carry: I Carry a Gun a Cop Is Too Heavy
Alan Gottlieb, Dave Workman
Merril Press, 2016 - Firearms - 264 pages
Indispensable history on the cutting edge issue in the battle over gun rights The right to carry a firearm for self-defense.
 
Foundation for Economic Education (FEE)
Why Gun Rights Are Essential In a World of Uncertainty and Scarcity
Firearms are the most practical and effective way for the average American to secure his or her life, liberty, and property.
Tuesday, May 19, 2020  
Aaron Tao
A common joke in the American gun community goes something like this:
 
Q: Why do you carry a gun?
A: Because carrying a cop is too heavy.
 
This humorous quip should not detract from the fact that many individuals in the United States (including me) own and carry a firearm for purely pragmatic reasons.
 
Twitter
#2A Wisdom
@2AWisdom
I carry a gun cause a cop is too heavy. - Clint Smith
11:40 AM · Aug 11, 2020·2A Wisdom Quotes
 
Twitter
Sean J. Green, JD, CFP®
@GreenLawPLLC
Replying to @politicalelle and @LIsaGreenTXGal
“I carry a gun because a cop is too heavy” - John Steinbeck
9:32 PM · Aug 23, 2020·Twitter for iPhone