Bob long Atomix Intimidator, Ions, most blowback systems.
Crossfire 88/45 w/ninja reg
Honestly? it's pretty good to go as is, Though a barrel probably wouldn't hurt, and the rip clip would help to get the profile of the marker really low.
Looks, performance, tool kit.
Saw the TM15 at the BT booth at Dday 2009, and got one around Christmas of the same year. I'd been shooting either an SP8 or a ion dropped into an airsoft body, so it wasn't anything really new in concept to me- that is, speedball marker rebodied for milsim.
First, the good parts. It's much like a TM7, though, as a reviewer before has said, it's designed to look like an HK416 with a magpul CTR stock. It's light- the main body is mostly a magnesium alloy, If I remember what they told me correctly, though I'd still recommend a sling for longer games.
It's pretty bloody quiet when shooting, which is for sure an advantage, Especially for sneakier players. this is a function of the design of the barrel shroud and barrel- I've heard people say that it gets louder with aftermarket barrels, But I couldn't say from personal experience, as the stock barrel shoots well enough for me.
The selector switch is a nice feature- actually, the electronics are very well-done for the marker overall, i believe. The on/off button is separate from the selector switch, and the battery is housed in the mag, along with a small (and admittedly unusable) toolkit. There's also storage for a spare 9volt in the mag, which is very nice, especially for longer games.
The marker came with an excellent toolkit, which included a name-brand 9v, all the necessary allen wrenches, spare screws, an o-ring kit for the marker, lube, and spare detents. This was a very nice, and very welcome suprise. the lube is crap, of course, but the rest of the tool kit is outstanding.
now, for the bad.
First and foremost, the trigger sucks. It honestly feels like a toy- complete and utter trash. Yes, it's adjustable, and many people disagree with me, but honestly, I think more work could have been put into the trigger. It doesn't have a whole lot of side to side play, though there is some, but it's still far from the greatest.
Second, the marker is hard to sight down during play. Not talking about using the flip up sights (I removed them) but in general, because of the way the stock and shroud are, it's hard to get a masked head behind the marker to look down the barrel. I've heard tell some people use red dots, I prefer not to, but it could be a solution to the issue.
In terms of performance, it's effectively a mini. with a few tweaks. It outshoots tippmanns with ease, and has passable (if not great) efficiency. It's ok with paint- not as picky as some markers I've had, but not as accepting of garbage paint as most mechanicals are.
All in all, I'm pretty impressed by the marker. it's nothing particularly great or ground-breaking, but it's a solid performer in it's price range with a lot of nice features.