SiderLock – External Safety on Glock Pistol [VIDEO REVIEW]

From the factory Glock handguns have no external safety outside of the trigger safety. Today we review a product that can be installed on the Glock to create a more traditional “button” like safety but, if you plan to install it on your every day carry gun, there are some factors you should consider!

About Matthew Maruster

I follow my Lord and Saviour Jesus Christ who is the eternal co-equal Son of God. I currently live in Plain City, Ohio with my wife and daughter. I served in the Marine Corps Infantry. I was a Staff Sergeant and served as a Platoon Sergeant during combat in Iraq. After I was a police officer at a municipal agency in San Diego County. I have a Bachelors's Degree in Criminal Justice from National University.

About Matthew Maruster

I follow my Lord and Saviour Jesus Christ who is the eternal co-equal Son of God. I currently live in Plain City, Ohio with my wife and daughter. I served in the Marine Corps Infantry. I was a Staff Sergeant and served as a Platoon Sergeant during combat in Iraq. After I was a police officer at a municipal agency in San Diego County. I have a Bachelors's Degree in Criminal Justice from National University.

19 Comments

  1. Justin on April 26, 2016 at 6:47 pm

    Excellent video!

    • Matthew on April 26, 2016 at 7:19 pm

      Thanks Justin. I appreciate the feedback and I’m glad you liked the information.

  2. Al on April 27, 2016 at 12:12 pm

    I’ve carried a Glock as my duty weapon for many years and I’m very comfortable with the safety situation provided by the factory. Before retiring I was a fiream instructor and SWAT memmer for many years. I now teach NRA pistol classes to people who are not as familiar wit sidearms as we are. Many students comment about the Glock not having a safety because they think a gun with a safety if a safer gun. Glocks actually have three safeties, however, nothing simillar to a 1911.

    The Gloch design was was produced to be a combat weapon for military use and it became a favorite of many law enforcement agencies around the world because of it’s ease of function and reliabitity. I can see why non-professionals would like a safety on the Glock. To start using a Glock with this Siderlock safety would take many hours of practice and I’m not sure even that would be enough if and when a person were to be engaged in something stressful that the shooter wouldn’t fail to disengage the safety.

    For the home defense gun, maybe a good device, for the novive that is starting out another maybe. For those of us who carried the Glock professionally for decades I think not. I will pass on it and use the methods taught to me many years ago, such as keeping my finger off the trigger until I’m on target and ready to shoot. As you know, Matthew, the best safety is between you ears. Good video and good info. Thanks.

  3. matthew on April 27, 2016 at 3:51 pm

    Hi Al, thanks so much for watching the video and for your feedback. I agree that ultimate gun safety is not built into the firearm, but the users actions. That being said, I like this concept for applications where the gun is most likely not going to be used in a ultra stressful situation and drawn from a concealed holster. Inside the home, in a hide-a-way or home defense dedicated safe, this could be something someone could install easily if they like glocks, but just really want a manual external safety as an added layer of protection.

    I was pleasantly surprised that manipulating the safety really didn’t make me feel as if the trigger would be inadvertently squeezed, and when practicing with it I trained my motion to take it off safe by pushing forward. Obviously this was done on the range inducing what physical and mental stress I could, not a true deadly force incident. But, from testing it out I did see it’s merits in certain applications. Home defense, range gun, or a ‘truck gun’ for those truckers that drive cross country and just want something in their cab; this safety is something they could try out. And at the price, and the fact that it doesn’t require a permanent modification, you can always swap back without any damage.

    Thanks again Al, I hope you find the material on this web page passes the test as far as coming from tactically and professionally trained people like yourself. Stay safe!!

  4. Brandon on April 30, 2016 at 4:45 pm

    IoIoououououoououououoool

  5. Yogi Bear on May 3, 2016 at 5:57 pm

    People that are dumb enough to want to put an additional safety on a Glock shouldn’t be allowed to have guns. Glock has spent a ton of money making it one of the safest guns on the planet. Glocks DO NOT accidentally discharged.

    • Matthew on May 3, 2016 at 8:05 pm

      Hi yogi, I agree that glocks and other quality firearms do not discharge accidentally. I think the majority of people who purchase a glock understand they are purchasing a firearm with no external safety outside of the glock trigger safety, and are good with that. I don’t think we should limit gun ownership from someone who likes glock quality but desires an external safety. I know there will be some people out there that this item appeals to, and I wanted to give them the pros and cons before they install it thinking it is a ‘magic bullet’. Thanks for the feedback and watching. For what it’s worth,I like my glock stock as well.

    • Paul Stewart on February 18, 2019 at 5:11 pm

      There are numerous incidents involving Glocks inadvertently discharging due to foreign objects pressing against the trigger. This has happened to professional LE’s who train regularly. I can only imagine the mishaps caused by women putting a Glock 43 or 42 in their purse with a round in the chamber. There are any number of objects lying loose in a woman’s purse that could cause a discharge. So there is a need for an external safety to help prevent negligent discharges. I have several double action single action pistols that don’t have external safeties but do have a decocker to aid in lowering the hammer on a live round. I don’t need the decocker, but it does provide a certain amount of safety preventing a slip and possible negligent discharge. A finger diesn’t always have to pull the trigger on a Glock.

      • Matthew Maruster on February 18, 2019 at 5:28 pm

        Thanks for the feedback. I disagree that a Glock handgun needs to have a manual external safety for the gun to be carried safely. More Glock handguns as carried on a daily basis by LEO’s than any other handgun. The number is incidents of negligent discharges are likely hirer in number, but it is impossible to conclude that they are more dangerous than any other similar striker-fires handgun. Especially if you compare the number of incidents with the number of hours where the gun is carried, and this number is obviously impossible to know.

        If one is putting a firearm with or without a manual external safety in a purse without first putting it in a holster, they are wrong. If anyone believes a gun with a manual external safety is inherently safer than one without they are placing their safety on a mechanical device. A gun, no matter how many safeties it has, is not safe or unsafe on its own. The user is what makes the gun safe or not. This is the same rational that legislators use to make their lists of ‘safe guns’ that us commoners are allowed to own.

        If someone wants a manual external safety on their gun great, but it doesn’t make it safer. Many instances of neglent discharges with 1911’s and DA/SA guns with and without decockers.

  6. Fred on May 4, 2016 at 1:25 pm

    I appreciate the video instruction. I’m new to firearms even though I served in the Navy 37 years ago. I’ve seen couple of videos where a person shot themselves and that safety probably might have prevented a negligent discharge. While all Safe Action triggers are relatively safe, to have an extra measure of safety might not be a bad idea for home defense. I agree that it takes hours, days, and even constant training to get used to it. But it’s worth considering having one. Thanks for the tips.

  7. Matthew on May 4, 2016 at 2:38 pm

    Hi Fred,
    Thanks for your feedback, and for your service to the country! An additional external, manual safety is definitely appealing to some people. I think it is safe to say that if Glock added a backstop/palm safety similar to 1911’s or the XDS they would still have people purchasing their firearm. I think that safety would be viable for a concealed carry option because it does not require any additional manipulation outside of the normal grip motion. As for the siderlock, I agree with you. While its not preferable for concealed carry, it has its specific application and group of people it is designed for. Like everything else in life there are pros and cons. I am very happy you enjoyed the article and got some good info. Stay safe Sir!

  8. Hal on March 24, 2018 at 10:47 am

    It’s true the purchaser and owner of a Glock is, or should be, familiar with their firearm and how it functions. The one big plus for the Siderlock feature is in the rare event someone who is not familiar with the gun and happens across your Glock when you are not present. A child or unfamiliar adult for example. This added feature of safety could save a childs life.

  9. Donald Ducko on April 23, 2018 at 12:08 pm

    First off let me say great video. Excellent job. As someone who helped design the original Glock, has carried a Glock since birth, whose wife gave birth to two glocks, who has carried a Glock in both world wars/Vietnam/Korea/Iraq, is on a SWAT team, teaches every class known to man and even taught the NRA everything they know I am not sure I would be comfortable using this safety in a stress situation.

    Ok. Someone try to beat my resume. I dare you.

    • Matthew Maruster on April 23, 2018 at 1:04 pm

      Hahahah great comment lol. Say hello to Gaston for me 🙂

    • Big Bob on June 28, 2024 at 4:14 pm

      I am the owner of a negligent discharge from a Glock. All my fault .

      That is my resume
      I now can assemble and disassemble my g42 as I installed my slider lock trigger safety.
      I installed a ghost edge connector and polished the trigger bar and now have a 3.5 lb excellent Glock trigger.
      I keep that hair trigger safe with my slider lock safety carry chambered with confidence and proud to be one of the concealed weapons carrier who understands safety first far exceeds ego over walking around like your in country in Viet Nam!.
      Strictly speaking as a civilian who exercises my 2 amendment right to bear arms.
      If you’re law enforcement than you are a target and need to be prepared.

  10. Bart Douglas on April 17, 2019 at 12:22 pm

    I know of older generations who were taught hunting and some who fought infantry who are use to external safety. This is how many of them role with years of indocrination. Untraining and retraining is futile. These elders should have have such a gun. I believe this for other people too as I think there are other scenarios that appy.

  11. Ben on July 15, 2021 at 8:29 am

    There are times that a handgun needs to have a round in the chamber (I realize some say all the time) – e.g. you’re in a situation with potentially dangerous people around you when it takes too much time/energy or makes too much noise to rack the slide vs. flicking off a safety. If you still want that gun concealed you don’t anything pressing on the trigger on the way out of your pants, or from your purse – once it’s out of your pants/purse you can flick the safety off. It’s very simple and easily trainable, because it’s just a little sideways pressure on the trigger itself.

  12. dennis stowers on January 22, 2022 at 7:28 pm

    if you are worried about a glock with a sidelock trigger in a stressful situation just keep it off. trigger is then back to the original function, When not carried put the safety back on if you feel the gun would be safer. If and this should never happen someone picks up your gun they will not be able to fire it !

  13. Hal Harker on March 3, 2022 at 2:13 pm

    I agree with Dennis Stowers.
    If you are in professional law enforcement, where stressful situations might present itself instantly, then by all means leave the safety in the off position and in a locked and loaded condition. Do this even if you are a non-professional and very familiar with your gun and want to be instantly at the ready while seated in your favorite restaurant.
    With the safety in the off position, it does not change the function of the original design if that is what you prefer as Matthew stated.
    But when not in use, or being used in non-stressful shooting range situations, or laying in your nightstand at home, where anyone who is not familiar with your Glock as you are could instantly pick it up and pull the trigger, the cross-bolt safety can be that added measure of safety to keep those who are not familiar with Glocks from shooting themselves or someone else.

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