I am looking into buying my son a 22lr for Christmas. I have looked at three different guns and can't decided on which on. The first one is a S&W M&P 15-22 mp15, the reviews on it have been mixed but seems ok after a few fixes for ejection problems. The second is a Remington VTR 597, it has a Target-style, free-floating 16" barrel that I think would be a plus. The reviews on it are all good from what I can see but it is not as good looking gun in my opnion (don't like the side plate). The third is the Colt / Umarex M4 Carbine .22 Tactical Rimfire AR-15. The reviews on it are good also, but don't know anything about the Umarex quality? The prices are $375 for VRT, $400 for S&W and $449 for colt, not really much to speak of. Any input or any own one or something I may be missing? Other brands?