No problem. I own many rifles I don't need. I have a 50BMG, .338LM..etc. I don't hunt and rarely shoot competitions anymore. I enjoy shooting, not for others but for myself. I own two Piston AR's and will not part with either of them. My first one was because I wanted one, then I started shooting suppressed and really working the rifles hard. They have never had a single issue. And before it is brought up. Don't worry about carrier tilt. I have seen it in a couple piston guns, mainly due to the wrong buffer and spring. I shot an HK MR556 in Georgia that had over 45,000 rounds with no breakage. It still shot 1 1/2- 1-3/4 MOA with factory ammo. They shoot around MOA out the factory door. For a 16.5" rifle it is pretty good. I have quite a few AR15 rifles of various makers. If I want precision, I go with my RRA 24" varmint, if I was run and gun for a course I pick one of my piston rifles. My Sig now has an Aimpoint PRO on it and the Hk is my K.I.S.S. rifle, with nothing but diopters.
If you want a piston gun, get one. PM me when you do. I honestly do think the Sig 516 is the best for the money. The Hk is arguably the best out but is heavy and expensive. LWRC is being bought by Colt, I am impressed with their products. I hope Colt holds just as high of a standard. As far as other piston systems, I have shot Adams and a small company here in NC that makes its own. I decided to stick with Sig and Hk.
Have fun deciding and let me know what you get..
P.S. I have not shot the Colt Piston gun but hear it is pretty good also.