Redspot (takes a while to get good at and it has some balance issues) but other than that, as long as you don't let some of the asshole players get to  you, and if you don't try to build a base expecting it to last, you should be fine.
RTR (even if you can't find a server you can always just make your own and play with a few friends) it isn't that hard to set up, and the game is still pretty good even today.

TDV2 (it's free now, which is pretty cool) you can get it from the topic in new releases, just make sure to get the one from post 12, not post 1, since it's newer, and if your going to play online, use server.coolfortheblind.dk. It's very fun, doesn't take long to get good at if you've used flight simulators before either. But almost all of the voice acting is so bad that at points it will make you want to kill your self just to escape it, and the story is, very, very stupid, as if it were written by a 12 year old.

Operation Blacksquare (for me at least) it's very hard, you die fast, and it's often difficult to line up with items to pick them up. But the sound design is great, the story is pretty good for that type of game, and it's still fun.
Bloodshed, Release the pain (not many people know about this one) it's a very simple game but it can be quite addictive, it's one of Sam Tupy's creations.
Battlezone (yep this one is still around) it works better without Peter's mod, and the first boss is still broken, but you can play it just fine anyway.
Super Liam (you can get this for free now) it's old, comparatively easy on most levels, and doesn't have random enemy spawning, but it can still be somewhat fun, especially if you haven't played it for a while.
World of war (this is pretty addictive) even if the trophies and movies are in Japanese, it's quite hard on the higher levels too.
Audio Quake with the Starwars mod (it can still be fun) but it can be really hard to get started and it's old as hell, plus their aren't many people on. Still, the chaos is wonderful...

I think that's all we've got for free bombs and guns action games right now, at least reasonably playable ones that are finished.

We also have The Gate and Psycho Strike, but allot of people dislike those and they are quite expensive for what you get.
You can get the Zompocolips and Parilis Hearts concept demos, they aren't too bad, but they are obviously short and won't be developed any more.

There is humans vs robots which is in beta at the moment but struck me as a pretty good idea for an online game ala swamp. It has issues but is worth a look if you fancy that type of thing.

also for a pure action fest, psycho strike from vg storm.
There are lots of mash the buttons type games around (battle zone being one), but for me psycho strike had good enough actual mechanics to be interesting, plus of course the hole slaughter people  manage criminals thing is just waaaaay over the top and silly, great for taking out your frustration in an amusing way.

On a more serious note I'd recommend The Gate from Vg storm though if your not into games where you fight ghosts and gremlins and such that might not be your cup of tea, particularly since as it's set in the medieval period there are no guns or bombs or what not. Both of those are commercial games.

There is then Copter mission from Oriol gaming zone. Oriol has done a great job with all of his games, and if your looking for an arcade action fest with exploding buildings, missiles and such this might be a good one to try.

I would also highly recommend both Zero sight and it's expantion pack, zero sight extended opperations from Shard workshop.
I don't know why these games arent' more frequently discussed, since they rock. Difficult aircraft sim games that will take a while to master, where you can fully customize your aircraft, handle variosorts of missiles and bombs, and best of all have a lot of randomness.

In the main zero sight game even though you have standard missions taking them  can change drastically due to things like weather conditions, enemy activity etc. And then in the extended operations version you even get randomly generated missions too where you have to destroy enemy aircraft.

Really if your in to flight sims, I very much recommend these, tough games to learn but well worth the time, they're commercial  but there is a demo available.

Then of course, you can't go wrong with the classics, namely Gma tank commander and Shades of doom. Gma tank commander particularly might very well bbe what your looking for if you want a lot of action with modern weaponry.

Of course there are lots more action games out there, but these are ones I'd personally recommend as having a little more in their gameplay to be addictive than just hammer buttons as fast as possible.

Hth.

You're my man, yea i've played lots ofthose including psyco strike's demo (i will buy though).

btw. i wanna renew my swamp gamer account but we're havving problem with pp here, any reccomendation? although i've asked the same on swamp's own thread.

Fyi, Alien outback is definitely still possible to buy, and Judgement day has been released as freeware I believe, so no problem with either of those.