Owned my R51 for appox. 4 weeks and put around 500 or so rounds through it. Also should note mine was a low serial number gun. At first, the slide was 'sticky, gritty, etc' but I admit it smoothed out, first 100 rds or so the gun did not malfunction and was great. Then it went to hell. Small issues such as grip screws working loose and some fit a finish irks. Then at least one round in every mag I put in it I would get a FTF so shooting it for a ccw was far from reliable (youtube R51 issues and my gun had them all). Called Remington and they said they would probably decide to just replace it with a new one if enough problems were found. Well it started as 2 week repair. Now they said they are working on 'updated internal parts' for it and it could be another 4-6 weeks. Well I decided to fork alittle more $ out and just trade it for a Shield 9. Picked her up yesterday, blew 100 rds through it and i'm in love! (don't tell my wife) So theres my R51 story, I realize its first year production and they are bound to have their woes but that was alittle much imo. I would recommend checking this gun out after a few years.