I am a new owner of a bushmaster XM15 M4A3 carbine and i'm very excited. I am just learning about the rifle. I am a police officer and will be using my AR for work. I know some of the basics as my dept provides ARs as patrol rifles and have provided some very basic info. I would like to know how I can improve my AR. I read some of the threads about different extractors and springs and O-rings. I want to have a top notch rifle. So far I have added the surefire four sided picatinny rail mount, an EOTECH 511, a Command arms pistol grip and fore grip. I have also added a rear sight for co-witnessing and a pentagon MS 3 Xenon light. What should I do (or have done) the internal portion of the rifle, cost does not matter, this has become an obsession. Also some advice on mags, I bought an extra bushmaster mag but I've heard there are better. THANKS TO ANYONE WHO CAN HELP.
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