GFD .17 HMR AR Upper

Garrow Firearms Development

The GFD .17 HMR AR Upper looks good on any AR lower.
The Kit comes with everything you need to add to your completed AR lower, including 2 ten round magazines.
The Kit comes with everything you need to add to your completed AR lower, including 2 ten round magazines.

March 2017

By: John Russo

When Hornady introduced the .17 HMR (Hornady Magnum Rimfire) most varmint hunters didn’t realize they needed a better round. We had been shooting .22s for so long we figured it was either that or stepping up to a centerfire such as a .223.  If you’ve spent any time shooting the .17 HMR you know now there was a gap that needed to be filled.  The .17 HMR gives us the ability to shoot targets and small game at distances up to 200 yards out of a rimfire rifle.  When it comes to shooting prairie dogs at close to medium range, it is my favorite caliber.

Garrow Firearms Development has created the world’s first gas-operated rimfire semi-automatic AR upper. This is a true drop-in upper and is designed to work with your AR lower, regardless whether it is a carbine or a rifle.  Owner/Designer Michael Garrow accomplished this through many ingenious designs.  I have spent an afternoon shooting a prototype and found it to be accurate and reliable.  Another cool thing about a rimfire AR upper, is it is legal in many areas that have banned ARs such as California.  Of course check your local laws first.

I will be doing an extensive test of the production uppers next month and will have a full review forthcoming. Check them out at

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John Russo is a life-long hunter, shooter and outdoorsman. He is a retired Police Sergeant from Southern California with over 29 years of service. He has been a SWAT Sniper, Child Abuse Detective and Homicide Unit Supervisor. As the leader of the Police Department's Firearms Training Unit, he has been teaching firearms for over 26 years to law enforcement, military and civilians. His credentials include a laundry list of certifications as an instructor and armorer on all types of weapon systems. John has been writing for various gun magazines for many years and has been published over 100 times on topics ranging from hunting, shooting, guns, training and law enforcement.