GPCA - GP 1945 Pen Gel Ink Refill GP22 Refill Smooth Writing German Ink Compact Size for Storage.

I had bought this pen on July 2018, this pen has been very reliable and durable as I drop it many times and using it to wedge between parts of machines(nothing crazy weight) to hold temporary position. As my use of the pen may differ from someone else but I am happy with the product and it fits my needs. And too be aware that the ink cartridges that it uses will last a few months before refilling as their relatively smaller.

Handsome pen, well made and feels good in the hand. Bolt action deployment works great, although a little low on the pen body, but that's to accomodate the built-in whistle. I could only find the M22 refills online as they don't have them available in the stationary stores in my area. The pen would be perfect if it took the Fisher Space Pen refills, but again to accomodate the built-in whistle, it requires the shorter M22 refill.

(Review starts at second paragraph)I actually bought the Kickstarter edition back in 2017 (I know it was only a year ago). I loved that pen, yes past tense. It was part of my EDC and I used it religiously. I lost it about a week ago and have no idea what I did with it. I tried to use something in the interim but I can't fill that GP1945 sized hole in my...pocket, hand, heart? So, I ordered another one from Amazon. I'm sad I don't have my Kickstarter edition anymore, and I can swear that the one I had before was slightly heavier than the aluminum edition I ordered this time, but nothing beats the size and feel of this pen to me. I grip pens tight when I write, so the the skinnier the faster my hand starts to hurt. This pen is the perfect size for me.Now on to the review. I've not had an opportunity to actually use the glass breaker, but I have tested it, and it'll shatter what you got. The whistle works fine, but as someone pointed out, when you remove the glass break the pen clip, that acts as the slide will be loose and you'll need to hold it. That was pretty obvious to me when I looked at how the pen was held together, apparently that surprised other reviewers, however; the new one I just ordered has a separate piece than the old construction. Meaning that when you remove the glass break, the clip is still held on to the pen with another retainer, so no worries. Good on these guys for paying attention to the customer feedback and adjusting the build.The pen's bolt action is super fun. It's not super smooth to begin with, it hitches here and there on the angles, but once you've ran it through a few times it'll start to smooth out just enough to make it just right. It's super satisfying to release the bolt action as I'm putting my pen away, it's second nature to me now. Clicking a pen top is just awkward, and I love giving it to someone else and watching them try to figure out my pen :) (insert evil laughter) I get numerous compliments on it as well, and they say, man that thing looks like it can break glass. Well yes, yes it can as a matter of fact. The knurling around the finger grip is NOT soft. I read a review someplace where someone was disappointed by this, it is a diamond cut knurling in the metal, unless you get the smooth ones (I think the titanium edition). I love it though it helps with the grip in my hand and it's never been uncomfortable to me. I used to use the Dr. Pilot pens because they were well balanced and had a good size and weight. My complaint was the soft finger grip would start to slip after awhile and then the pen would just annoy me. No problems with that here. This pen is well balanced, and has a great weight. (again I think my Kickstarter was heavier which I miss, or it was in my head, but this one still has a good weight)Well it does everything else, but how does it write? I've not had any problems with the pen writing. Be aware the GP22 pen refills are small. If you do a LOT of writing I'd probably recommend something else, maybe the space pen (which I also own, but I don't like how much flow those pens have). I use my to write with daily, taking notes at work, and reminders for myself and it usually lasts me a few months. If I had to average I'd say a refill of daily use will last me about 4 - 5 months. Your mileage may vary. The pen writes smooth for me, and in all the refills I've used up til now I've never had a refill that was jammed or didn't work. Overall I'd say if you are in the market for a tactical or tacticool pen, then pick this one up. Especially from Amazon, the worst thing you'll have to do is pay return shipping if you don't like it right? Go ahead and give it a try. These guys have built a good quality pen and it's a great conversation piece.Oh I will make one note. On both of my pens the bolt action catch screws on, both kept coming slightly loose as I used them. I had to twist it back on tightly. Eventually I did it so much on my first one that it stopped coming loose. I read that someone used a little locktite on the screw which is a good idea, and if this one does come loose I may try that, but for the interim I'll keep checking it to make sure it's not loose.

This might be a good pen for $20, but for $50 (and not even made in the USA) it was a mistake to get. The opening for the ink stem is too large - which makes writing difficult and sloppy. Another reviewer had the same problem, and I should have listened. The bolt action is also not fitted well - it rattles. Which isn't too big of a deal, it is a subdued sound.As far as the tactical nature of the pen, I like the features. I've had the Uzi and Gerber tactical pens, and this is the best designed out of the three.The other problem, is that it takes a small special cartridge, which isn't as readily available as a standard one (and doesn't hold as much ink). Plus, the actual tactical waterproof and pressurized cartridges (so you can write upside down and whatnot), are not available in this short size. At least not that I have found.

This is an awesome pen that I always carry in my car now. There's always a need for a reliable pen in your car, and this one can break a window in case you're trapped. Also, the whistle is nice to have just in case. The action is really fun to fidget with and the construction is strong enough to where I don't believe it'll ever break under normal use.

Very sturdy and super cool to show off to buddies! The pen writes very smoothly. The whistle is a bit hard to use and once you get it, it's loud and fierce. Haven't got chance to use the glass breaker, hopefully never will need to !

Not as expected, expensive,not recommend.

The bolt action feels good. You could really feel the quality. I tested all of the featured advertised and they all work. I got a scrap glass laying around and it breaks easily. The pen is just a regular ball point pen. It would be great of it was a gel. But other than than. The pen is perfect.EDIT: After months of use, I got some scratches on the paint which I don't really mind. For some reason though the pin that you use in the bolt action started to come loose and eventually I lost it. So yeah. Not sure if they sell spare parts or what but I can't use the pen anymore since I can't deploy the pen.