That would be the pot calling the kettle black if it were...

 

Just buy a new gun that comes with a free cable lock! Or buy a gun lock if no one is giving them away for free. I got 3 for free, plus however many came with guns that I bought. Another option is a Master Lock Python that locks anyplace along the 6' long cable. Prices start at 15 bucks for one with a skinny cable. If you want good ones with cables 3/8" thick to lock up your ATV, you can order as many as you want keyed alike for 30 bucks. https://www.masterlock.com/search?q=python