Hi all, new guy here. I shoot semi regularly as it stands, but the cost of ammunition is really limiting me. Now, I already have a PPQ M2 GBB to simulate my carry gun, and I absolutely love it. BUT, I would like to attain an M4 airsoft that would serve as a training aid for my actual AR-15. I am unsure of whether to get a GBB or an AEG and also which brand. I have built ARs before, no biggy, but these are kinda new to me. The GBB challenge kit that Evike sells is tempting, but I have heard mixed reviews. I would like to have as close to real feel and function. I look forward to your recommendations. Thanks.