A heat shield panel arrangement for use in a combustor of a gas turbine engine is disclosed. In various embodiments, the heat shield panel arrangement includes a first panel having a first rail, the first rail having a first distal tip and a first angled outer wall, the first distal tip having a first distal tip length; and a second panel having a second rail, the second rail having a second distal tip and a second angled outer wall, the second distal tip having a second distal tip length. The first distal tip length is less than the second distal tip length and the first angled outer wall is substantially parallel to the second angled outer wall with a gap formed therebetween.