Hey Kyle,
I encountered the exact same questions about 4 months ago when I was looking for a new gun and wanted an upgrade from my reliable BT 4 that I have been using for years now. I have not cleaned my BT 4 ONCE in the numerous times I have played. It just never fails fails me. From there I gave the X7, Tiberius 9, and Flatline a try then ultimately settled on the BT TM 15 because of my favoritism for the BT 4's reliability.
From hours and hours of trial and error, I can narrow the precision and accuracy of a paintballers shot to the following factors:
Above all else the very first determining factor is the
players play style. You cannot put a speed baller on a pump gun nor do the complete opposite and expect that player to strive. You have to ask yourself how you like to make your kills and how well your wallet can handle. Do you like overpowering your opponent with a fully auto and leave it to higher chance shot per hit probability, or do you like holding your breath for that single, clear, defined shot that you bet all your money on which pump players are known for.
Besides that one key deterministic factor, one has to consider the influence of equipment to the following attributes:
- Quality/ Nature of Paint
- Paint size to barrel size matching
- Consistency of your gun
- Weight and layout of your gun
1. Quality/ Nature of Paint: You simply can't use paint that is crap. By crap I don't necessarily mean the cheapest paint, but the way the paint has been stored and handled. Sometimes you can buy a case of marbelizers that will break like no tomorrow if they were stored the wrong way. Once you get chomping or barrel breaks accuracy and precision is out the window. Some guns are particular to certain paints too. My BT 4 can use any kind of paint without chomping but frostbites just roll right out of the barrel if I point down or paint that has worked beautifully in my Flatline would not work in my Tiberius and vice versa. You should have to get down and dirty with your gun and paint and be a slut about it to find the right combos. Once you get the right combo ..... oh you'll know. The sensation is like seeing the hottest girl and having her smirk back at you.
2. Matching paint sizes DOES increase precision and accuracy but you have to be aware of the limitations. The closer you get the size of the bore to your paint the smaller of the radius of your aiming circle if you hold your gun in the exact same spot when you fire. In my experience I have tried using different barrels and eventually switched to the size matching inserts. The inserts did improve and reduce the area where the balls were landing. We tried this at the Winery on many occasions. However, I know from experience if you fit the inserts exact to the paint, doing full auto becomes a problem because you get jams and the balls get plugged up in the insert due to the tight fit. This come back to your play style essentially in #1. Another benefit to paint matching is that it saves you air.
3. Consistency of your gun- This is clearly noticible between the $140 BT 4 and my $400 tiberius and the TM 15. Shooting them side by side, the air consistency for the cheaper guns is quite unpredictable. You'll occasionally get one or two that doesn't seem to have enough air to fly the projectory that it needs to. An inline regulator would definitely fix this issue. This is not a major problem but can be annoying at times. If you play full auto all the time or rely heavily on a stream of paintballs to make your mark, this would be factor you may want to consider.
4. Weight and layout of your gun- Having a lighter less cubersome gun helps you aim SO MUCH FASTER. This is why the most expensive guns are usually the smallest lightest ones. With that said, the BT TM 15 is a perfect counter example. Even though it is super light, the loader is set up to be RIGHT infront of your freaking face. So you can't really aim with that either, you just have to go by instinct of where your sweet spot is.
In my personal opinion and judging from the people that shoot me the most, the most accurate and precise players are those that use the least amount of paint, (Ahem Mike Tek, and all you pump lackey's out there). In my personal recent experience from paintballing about 2 times a week since June, I get more kills per round when I use a 50 round take hopper versus my automatic loader. So from numbers alone I think it says something.
My best suggestion to you is use what networks and friends you have infront of you right now. Ask the usuals on the forums and games to let you give a field test and comparison test from one product to another. Thats the only way you'll find out what you want. I have to thank Marb, Mike Tek, Tex, Brook, Berry, Atomic, and everyone for helping me when I was trying to decide what I want to narrow down my gear to. They have saved me hundreds of dollars from blindly buying something that was suggested to me without real hands on evidence.
I hope that helps Kyle. Like I said, I have asked the exact question before and there are extensive topics within the forums on every aspect that I have discussed. I just collected it together and summarized it on here.