EOTech 553 - Manual (Page 5)

• All moving parts of the sight are permanently lubricated. Do not try to lubricate them.
• Do not use deteriorated or corroded batteries. Inspect batteries for rips, tears,
dents, or cuts in the housing. If there is any exposed, internal content of the battery,
it could effect the operation of the sight.
• The SU-231/PEQ (HWS M553) is designed to mount only to rail systems that are
made to the dimensions of the current MIL-STD-1913 rail specification. Rails which
do not meet the dimensional requirements of the MIL-STD-1913 specification may
result in the sight fitting loosely, moving on the rail during recoil, or not allow the cam
levers to close properly.