I'm considering either an AR-15 pistol or a Kel-Tec PLR-16 for a "short" (but not SBR - I live in WA) suppressed option. Anyone have any experience with AR-15 Pistols? Are they reliable with the correct ammo? It seems to be that there may be some feeding issues with sub-sonic ammo in either of these guns Anything to look out for or avoid? Other suggestions appreciated but I'm leaning towards and AR-15 pistol type configuration since I have a suppressor already on order.