Too much to think about or lots to think about ?
After watching many Youtube videos about what is coming out in 2012 I was mostly bored out of my skull trying to understand why I would bother spending another $2000 for an AR15 that is slightly different than what I already own. Sure there are improvements but spending $2000 on something that is 5% more of a gun than an AR15 that you already own doesn’t justify the cost. I am a big proponent to upgrading what you have. There was a really good article in Swat magazine years ago about improving what you already own and the small things you can do to improve your AR15. Replace extractor springs, stake screws, lube your gun right and you’ve just improved your gun for less than $150.
If you are looking to make your Carbine a firearm that you can rely on, make sure you don’t over think the configuration and setup. I understand why people spend $2000 on AR15 upper receivers that have folding front and rear sights, but if you have folding front sights keep in mind that you have one more step to getting your firearm up and running and that is something to seriously think about. I am a firm believer that people need to adapt to weapons and gear and not always expect to adapt the firearm to them. Fixed front sights have been around for a long time and I don’t think changing that another thing that needs to be folded or screwed on is worth the liability.
What is it? The TAC-PAC is a modular storage system designed to store tactical batteries and other small parts. It consists of an injection-molded housing with interchangeable EVA foam die cut inserts. The housing and insert is closed with a snap-on rubber sealing lid. This is then placed into a tactical nylon storage pouch. Why do I need one? If you have ever searched in a pack or gear bag or pocket or desk for spare batteries or parts, you NEED a TAC-PAC. You will always have spares and always know where they are. Be prepared with the TAC-PAC.
What is it? The TAC-PAC is a modular storage system designed to store tactical batteries and other small parts. It consists of an injection-molded housing with interchangeable EVA foam die cut inserts. The housing and insert is closed with a snap-on rubber sealing lid. This is then placed into a tactical nylon storage pouch.
Why be without spare gas rings or an extractor? A complete bolt can be at your disposal ready to be installed, and the parts necessary to repair the faulty bolt are stored handily for the needed repair. You just supply the level of 
What will fit inside? Each TAC-PAC comes supplied with 2 inserts (1 die cut and 1 blank), a storage pouch, and the hard case and rubber lid. It is a complete storage system. The LE insert holds (8) CR-123 batteries. The MIL insert holds (4) CR-123, either (2) N or (2) AA, and (1) 1/3 N size batteries. 
Why be without spare gas rings or an extractor? A complete bolt can be at your disposal ready to be installed, and the parts necessary to repair the faulty bolt are stored handily for the needed repair. You just supply the level of spares you think you might need. Store your 
Why be without spare gas rings or an extractor? A complete bolt can be at your disposal ready to be installed, and the parts necessary to repair the faulty bolt are stored handily for the needed repair. You just supply the level of spares you think you might need.