Alright noobie-- what did you not understand? I'll walk you through this.
You posted an Israeli made weapon called a Tavor. The Jews typically get alotta things right when it comes to Mossaad-- but the Tavor ain't one of them. It's a "bull pup" design rifle-- which means the bolt and the mag (don't call it a fvcking clip) are located at the REAR of the weapon. This makes a few things about it really sucky.
1. Good luck shooting lefty. When you've got to ckear corners, both left and right, you've got to be able to switch the weapon from shoulder to shoulder. One corner you're a righty, the next you're a lefty. Bullpup designs are hard use in ambidextrous fashion.
2. Trigger mechanism sucks. Since the trigger is further away from the bolt, there's extra parts or "linkages" involved when you pull the trigger. More moving parts = more chances for problems. And because there are more parts-- you get number 3 problems--
3. Dirt. Bad guys don't hang out in dirt free places. Bad guys live in mountain passes, deserts, swamps, jungles etc. Those places have dirt, grime, sand and mud. Get that stuff in your Tavor and it clogs up the works-- and then you're dead. Couple that with a crappy trigger pull which reduces accuracy over distance and I think you're starting to get my drift.
4. Reloading. If you're used to pressing the mag release button, slinging out your empty mag and quickly ramming home a fresh mag and hitting the bolt release-- thus getting you back in the fight quickly-- good luck with a Tavor-- or any bullpup design. A decent shooter could cycle through 5 mags on an AR platform before you could cycle through 3 on a bullpup.
Does this help you any?