AirMarksman Undertaker Standard Rail, Black Adds bottom Arca-Swiss rail Additional Arca-Swiss rail under trigger guard Allows balancing the air rifle on a tripod under the trigger guard Eight M-LOK slots on each side Tall sidewalls to protect the barrel Integrated barricade stop Four internal weight slots Weight: 2.2 lbs. Arca length: 16.5" Overall length: 25" Compatible with the FX Dynamic and FX Panthera Designed and made in the USA