Hands-down, without a doubt, THE BEST PURCHASE YOU CAN MAKE FOR YOUR AR-15. As far as priority of purchase, I would place this right after body armor and before a premium optic. Hell, buy this before you even grab a Holoson red-dot/prism or a Primary Arms ACSS (I'm gay for the ACSS reticle). Your savings in ammunition is the most obvious thing in the world. Because of this beauty, I've been able to put 25k rounds through this weapon system yearly for the past 4 years as opposed to 1k-2k yearly. Not exactly as much as Lucas or Garand Thumb but I've built muscle memory and skillsets for this weapon system that I can trust. But here is where this weapon system rechambered in .22lr shines, in the audio signature. Standard velocity .22lr coming out of a 16 inch barrel is going to peak around 115 decibels. A couple of hundred meters in the woods and no one is going to give a shit even if they did hear it. So, access to the woods around your house will give you a static range You can further reduce audio signature through specialized ammo. Super Colibri's get so quiet that a buddy and I nailed a 3A panel to the wall in HIS APARTMENT building and emptied a couple-four 50 round boxes and no one said a thing. The problem with super Colibri's is that they do not cycle in semi-auto rifles, not without cutting the recoil spring on the bolt which I didn't go as far to do. But there are plenty of specialized rounds that have velocities around 700 fps that cycle just fine is semi-auto platforms, suppressed or unsuppressed. You get where I'm going with this? Next move is to either purchase a suppressor and get your tax stamp or build one and get your tax stamp. Now you have a high capacity semi-auto battle rifle that you are ready to train with. If you have your own land then the sky is the limit. Build a shoot house out of plywood and get proficient at stacking up, pieing corners, and covering your motherfucking sector without having a camel jockeyshoot you in the neck with a Draganov. Your imagination is the limit. Last winter I got to ride bitch on a snowmobile in the dead of night in full combat gear, including SAPI plates and ACH helmet, while wearing Gen 3 PVS-7's and crack off with my suppressed AR equipped with a PEQ-15. Words cannot express how awesome it was. I felt like I was in an N64 James Bond 007 video game. You can do this too! You can master this weapon system and do all sorts of awesome shit. Why? You have the right to do so and it's enumerated in the Constitution of the United States of America.So grow some balls, spend a little bit of money, go out and have a blast training while you prepare for the shit to go down.