Standard .68
.68 caliber. the paintball standard.
An eframe trigger is only an accessory, the fenix is a functioning gun.
best is a matter of opinion but by a large margin the spyder fenix or azodin blitz are currently the lowest priced markes ($150) that have the most features on them
Disassemble the gun, and replace the back cap with the stock or take it to a paintball store, and ask them to.
A paintball gun
You can purchase a Spyder Paintball gun directly from the Spyder Paintball website. There are also options for new or used Paintball guns on eBay. There is a wide variety to choose from.
as long as it is spyder threaded yes
Fifty caliber, but it is more of a toy than a paintball gun.
Spyder MR100 Pro is the RIS Quad rail system that fits the Spyder MR1 paintball gun.
It is the standard .68 caliber
There is no "ak-47" paintball gun. there are many companies that make guns that are styled after the Kalashnikov series rifles. On the same note, Spyder makes several models of paintball guns, which vary from beginner "wallmart guns" to decent enough middle classed markers.
In U.K, the paintball fields set them at 270 FPS, but when you buy the gun it should be around 300 FPS, you can buy chrongraphs for $10-20 to test the FPS,