Just got a Matthew Martin titanium tactical pen. So beautiful… been carrying my zero tolerance for years but this thing is in a whole other class
Untill the disposable pens flodded the market, I used a Fisher spacs pen refill in a parker body.
They tend to put a glob of ink around the point every now and then.
All the Best,
Jeff
I use fountain pens since primary school. They can leak 
My favorite pen by far is the BIC Atlantis. They are very smooth, quick to start writing, feel good in your hand, never had one leak, and are reasonably priced. I’m not a pen expert, but over the years I’ve used many different pens and the Atlantis beats them all. But I’m sure if you want to pay more, there are better pens out there.
I'm old school style....hmmm wonder why there's not too many birds around my place??
I use any pen I can find that will take the Parker QuinkFlow Gel medium (0.7mm) tipped refills.
I have a thing for bolt action pens, THIS is my favorite but, there are plenty of other pen bodies that can take those refills. Before I used those it was the Zebra G-301. Still have a bunch of them around the house.
Sweet pen just ordered it (:
I’d like to see when you take out your pen knife to dress the nib of the quill.
Actually it would be really interesting to learn that (today useless) trait.
Seems we used to have pens that would write on buttered paper, upside down, in space. Now 90% of the pens I try to use are worthless if they haven’t been used on almost a daily basis, which is pretty rare for me anymore.
I’ve discovered Staedtler permanent Lumocolor. Write on damn near anything, tends to stay permanent even on difficult surfaces (there are limits), and you can get a re-fill pot for different colors. Beat the hell out of Sharpie fine point.
I always rely on a Zebra 402 and a Muji gel pen. No leaks so far.
I have these, they don’t leak. They write under water, upside down, under 0 gravity (if you happen to be in space), etc
I’m partial to fountain pens and this is what I use daily. It retracts and clips tip up to help prevent any leaking from the nib. When the tip is pushed out, the little trap door seems to prime the nib for immediate ink flow.
I bought the Fisher Space Pen ‘Bullet’ model in brass for carrying in my pants pocket. I really like the form factor and that it transforms to a full-sized pen. It has developed a beautiful patina.
I was not impressed by the stock ink cartridge. It seemed to create a blob quite often when starting. I found a list of cartridges that can be modified to fit, and ended up with a Zebra refill. I like it much better.
That was a great episode of Seinfeld I’m thinking about re-watching the whole series
I use a Tacray Tc4 titanium pen and a brass bolt action pen that both use the Parker refill’s. I have had them for years now and they both write smooth with no problems in any position.
I have several tactical pens but my favourite ones are the Benchmade 1100 with the blue Fisher space refill.
Definitely check out the Matthew Martin 500 (full-size) titanium screw top. I actually want to get his zirconium pen but it’s sold out everywhere
‘Pilot G-2 07’ Smooth even flow, no leaks, cheap.
I have been using one of these twisty metal pens for quite a while.
It’s also available on AliExpress.
With Parker G2 refill it writes quite nicely. It’s cheap and durable. I don’t want a “tacticool” pen but I love this one for its durability and tough pocket clip, it’s actually tougher than my flashlight’s pocket clip.
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I used to carry Zebra F-701 but it’s not durable enough, pocket clip always broke. Also, this Aluminum Alloy Ballpoint pen with Parker G2 refill writes nicer than Zebra F-701.
I have had another metal pen with bolt action mechanism which I also liked very much (also takes Parker G2 refill), been using it for a few years. Then I gave it to a friend of mine.
I still love bolt action pen but this new one with twisty mechanism is cleaner without protruding thumb stud, very practical, IMO.
I still love bolt action mechanism very much though and been considering to buy another one.
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It’s about USD 1.5 on AliExpress :
Aluminum Alloy EDC Ballpoint Pen
https://www.aliexpress.com/item/4000558245340.html
(no affiliate, that link is just an example, I didn’t even buy it from that link, I bought it from local online store, exact same item though 
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I also have some Uniball Jetstreams and I like them (black, red, blue), they write very nicely with stock refill . Not pocket EDC though, not tough enough.
Also some Zebra F-701’s which aren’t tough enough (broken clips) 
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For full-time pocket EDC : twisty or bolt-action mechanism is the most ideal, IME.