[Guest Post] The Glock 21SF

[ This guest post was written by savethegun ]

I believe, for me, the Glock 21 to be the ultimate defensive pistol, here’s why …

First things first – full disclosure. I was introduced to firearms and shooting sports at a very young age. I have never hunted with a handgun and I have never served in the military. I mention this because I believe both hunting and the military predispose people to a certain mindset. As a civilian, I have no bias and therefore see myself as an objective authority on my own preferences. I have shot nearly every defensive pistol available in the civilian world and own other handguns – both cheaper and much more expensive. Additionally, I do not work for any firearm manufacturer and do not endorse anything I have not used and abused personally.

This Glock has seen range time all over Arizona and Northern California, as the author frequently spends time in both locations. AZ law allows unpermitted open carry, and the use of full-capacity magazines. CA law restricts magazines to a 10-round capacity and does not allow open carry of a loaded handgun. This means that this particular gun fills dual roles. In AZ, this Glock 21 becomes an item of every day carry. In CA, it is strictly used for home defense. This particular model has the standard rail and ambidextrous safety.

The author modified the gun to better suit his preferences. A Streamlight TLR-1s is frequently installed for low-light duty. Trijicon night sights were installed. A Ghost Inc. 3.5 pound trigger connector, along with a factory extended slide release were added. And finally, the author despised the factory plastic guide rod, so a stainless replacement was fitted. Without becoming excessively tangled in debates about 9mm versus .45 ACP, or whether or not the 1911 is the greatest fighting handgun of all time, the author chose this particular gun for it’s large size, knock-down power, double stack magazines, and Safe Action safety system. Full-capacity Glock 21 magazines hold 13 rounds.

The Glock 21SF fits this author’s hand like a glove; A 1911-style pistol is too narrow and doesn’t fill the palm. The 3.5 pound trigger connector makes for a significantly better trigger pull, although the common “crunchy” feel of Glocks is still somewhat evident. The grip angle takes some getting used to for a few shooters. For this author, it is a hallmark of the Glock shooting experience. The Streamlight TLR-1s is an absolute delight-it is cheap and reliable and has yet to fail. The gun has had zero failures in thousands of rounds- a testament to the reliability of Glock pistols.

The author’s Glock has become a favorite because of its simplicity. There is no external safety. The Glock Safe Action design uses a partially tensioned firing pin lock. When the trigger is pulled, three safety features are automatically deactivated in sequence. For this author, the Glock Safe Action system makes for the simplest and most reliable defensive pistol. This gun, along with a Blade Tech holster, will be taken to Front Sight Firearms Training Institute in early May for a defensive handgun course. This author trusts his life and the lives of his loved ones to this custom Glock 21SF.

This article was written by a Guest Author. The views contained in this article reflect that of the author and not necessarily that of The Firearm Blog or TFBTV.


  • Billy Bones

    Glock 21 is a great weapon, even moreso, when a Glock 20 slide, barrel and magazine convert it to 10mm. Further, a .40 S&W barrel can be used to take advantage of that caliber’s lower cost and enhance the base firearms flexibility.

    And of course a .22lr kit further’s the utility of the Glock21!
    in this regards, It is the all-round pistol bar none.

  • Burton

    The gun has an ambidextrous safety? Since when do Glocks have safeties?

  • Marc

    “knock down power is a myth.”
    Handgun Wounding Factors and Effectiveness
    FBI Academy – Firearms Training Unit

  • mike

    You meant to say ambi-mag release

  • Thanks for the correction Mike. Yes, it should say ambidextrous magazine release.

  • charles222

    Interesting, although I’ve always craved a 20 for some reason.

  • Other Steve

    Now if only it was 4″ wide I might consider one.

    Seriously least ergonomic 45 out there. Go handle an M&P 45 and you’ll change your mind soon enough.


    I migrated from 9mm glocks/M&Ps to .45 glocks, then down to .40 cal glocks. Among my .45s was the G21sf (and the g36). I have caliber remorse now but I still love the 40 cal ones for mag capacity, weight, and thinness. But man, if there was a real mid sized glock 45, I’d be back to the 45 glocks in a heart beat..and have a g21sf again with the mid sized, and then for fun a g30 or g36 again. I don’t understand why the G21sf is not the preferred military sidearm..there’s no more perfect combat gun than the G21sf. Pull and shoot..and shoot, and shoot, and if you run out, it’s a nasty pistol whippin’.

  • michael

    “…the author chose this particular gun for it’s large size, knock-down power…”

    You must mean hitting someone upside the head with the pistol? In that case, when used in ball peen hammer mode, I’d suggest an all steel 1911. As Marc indicated, standard handgun bullets (that is, anything you can shoot without breaking your wrist) have no “knock down power,” although a box of 45 FMJs when slung in a sock could. Other than that, you have a fine pistol that should serve you well.

  • Just a minor stylistic comment, but you might simply want to say “I” instead of “The author”. It leads to less cumbersome sentences. The formalized third person is even falling out of favor in professional publications now, so you definitely don’t it in blogging.

  • cc19

    “…I have no bias and therefore see myself as an objective authority on my own preferences. I have shot nearly every defensive pistol available in the civilian world and own other handguns – both cheaper and much more expensive.”

    Thus how the author figured out what fit him most. I encourage anyone looking for a pistol to do the same. What’s best for him, may not be the best for you. I keep telling this to anyone who asks me what pistol they should buy. Try before you buy; “test drive,” them as if you’re buying a car.

  • Thanks Marc and Michael for the information; I read and absorbed the referenced material. Cyde- I agree with you completely about my cumbersome wording. I will take your advice and steer clear of the formalized third person! Other Steve- I have shot an M&P 45 before and recently went to a gun store to check one out and refresh my memory. While they’re very nice, they’re just not for me. If money was no object I might own one, but the Glock would still be my go-to defensive pistol. But that’s just my personal preference!