M3 basic, Jt excellerator 6.0, and of course the M3 Stars and Stripes
M3 patriot sniper, stock 12 in barrell, 12vt ReLoader. Co2
People suggest Delrin Bolt, i have learned much about it and figured out it doesn't improve much. I've also heard about different Barrels, but I don't think that is necessary either, the gun shoots great with stock.
The accuracy is magnificent, the consistency of fire, the low pressure chamber, the mouse click trigger, the LCD display, the ease of disassembly (don't be afraid to take it apart!), and it has a sharp took to it. The price is outstanding too, you can get them for around 195 now from most sites. My stock O rings haven't broken yet either, some people seem to have a problem with that. I suggest you clean out the action with a 50/50 water/alcohol solution and then put a light layer of oil down before shooting, i did and it works great. I think its helping the O rings too. ~It stores air
The stock trigger makes the gun FEEL cheap. Mine came with an aluminum trigger but installing it took some work. I had to file down some of the aluminum in the trigger hole, but it worked out fine.
The velocity adjuster doesn't really affect anything, this maybe because of the low pressure system i don't really know, but it shoots accurately at 30 yards, so i don't mind.
If your using Co2 like me, you can be restricted from some of the features on the gun such as 20bps, but anybody that shoots that much deserves to pay for that much paint. ~It stores air
the gun is well made.. the upgrades are unnecessary but they may work well with some people. For the price and functionality its a sure buy.